| **Postretirement Benefits**                           | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Compensation and Retirement Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Postretirement Benefits                               | Postretirement BenefitsDefined Benefit PlansWe provide postretirement benefits to a substantial portion of our employees and retirees. Costs associated with postretirement benefits include pension and postretirement health care expenses for employees, retirees, surviving spouses and dependents.Obligations and Funded Status A summary of the changes in benefit obligations and plan assets is as follows: Pension Benefits Health and LifeInsurance Benefits(in millions)2015 2014 2015 2014Change in benefit obligations       Benefit obligations at beginning of year$4,041 $3,943 $1,957 $1,674Service cost13 12 6 5Interest on obligations142 158 71 68Actuarial loss (gain)146 176 (34) 319Curtailments— (2) — —Contractual termination benefits(1) 23 (1) 2Currency translation(53) 49 — —Plan participants' contributions— — 31 40Subsidy receipts— — 40 34Benefits paid(309) (318) (183) (185)Benefit obligations at end of year$3,979 $4,041 $1,887 $1,957Change in plan assets       Fair value of plan assets at beginning of year$2,627 $2,519 $415 $447Actual return on plan assets27 206 3 26Currency translation(51) 42 — —Employer contributions113 164 2 2Benefits paid(294) (304) (51) (60)Fair value of plan assets at end of year$2,422 $2,627 $369 $415Funded status at year end$(1,557) $(1,414) $(1,518) $(1,542) Pension Benefits Health and LifeInsurance Benefits(in millions)2015 2014 2015 2014Amounts recognized in our Consolidated Balance Sheets consist of:       Noncurrent asset$13 $— $— $—Current liability(15) (15) (78) (79)Noncurrent liability(1,555) (1,399) (1,440) (1,463)Net liability recognized$(1,557) $(1,414) $(1,518) $(1,542)        Amounts recognized in our accumulated other comprehensive loss consist of:      Net actuarial loss$2,234 $2,019 $618 $664Net prior service cost (benefit)— 1 (1) (6)Net amount recognized$2,234 $2,020 $617 $658The accumulated benefit obligation for pension benefits, a measure that excludes the effect of prospective salary and wage increases, was $4 billion at both October 31, 2015 and 2014. The cumulative postretirement benefit adjustment included in the Consolidated Statement of Stockholders' Deficit at October 31, 2015 is net of $533 million of deferred taxes related to the Company's postretirement benefit plans. Information for pension plans with accumulated benefit obligations in excess of plan assets were as follows: (in millions)2015 2014Projected benefit obligations$3,631 $4,041Accumulated benefit obligations3,612 4,021Fair value of plan assets2,061 2,627Generally, the pension plans are non-contributory. Our policy is to fund the pension plans in accordance with applicable U.S. and Canadian government regulations and to make additional contributions from time to time. As of October 31, 2015, we have met all regulatory funding requirements. In 2015, we contributed $113 million to our pension plans to meet regulatory funding requirements.  We expect to contribute approximately $100 million to our pension plans during 2016. We primarily fund other post-employment benefit ("OPEB") obligations, such as retiree medical, in accordance with a 1993 Settlement Agreement (the "1993 Settlement Agreement"), which requires us to fund a portion of the plans' annual service cost to a retiree benefit trust (the "Base Trust"). The 1993 Settlement Agreement resolved a class action lawsuit originally filed in 1992 regarding the restructuring of the Company's then applicable retiree health care and life insurance benefits. In 2015, we contributed $2 million to our OPEB plans to meet legal funding requirements.  We expect to contribute $2 million to our OPEB plans during 2016.We have certain unfunded pension plans, under which we make payments directly to employees. Benefit payments of $15 million and $14 million for 2015 and 2014, respectively, are included within the amount of "Benefits paid" in the "Change in benefit obligation" section above, but are not included in the "Change in plan assets" section, because the payments are made directly by us and not by separate trusts that are used in the funding of our other pension plans.We also have certain OPEB benefits that are paid from Company assets (instead of trust assets). Payments from Company assets, net of participant contributions and subsidy receipts, result in differences between benefits paid as presented under "Change in benefit obligation" and "Change in plan assets" of $61 million and $51 million for 2015 and 2014, respectively. Components of Net Periodic Benefit Expense and Other Amounts Recognized in Other Comprehensive Loss (Income)The components of our postretirement benefits expense included in our Consolidated Statements of Operations for the years ended October 31 consist of the following: (in millions)2015 2014 2013Pension expense$69 $106 $116Health and life insurance expense81 54 61Total postretirement benefits expense$150 $160 $177Components of Net Periodic Benefit ExpenseNet postretirement benefits expense included in our Consolidated Statements of Operations, and other amounts recognized in our Consolidated Statements of Stockholders' Deficit, for the years ended October 31 is comprised of the following: Pension Benefits Health and LifeInsurance Benefits(in millions)2015 2014 2013 2015 2014 2013Service cost for benefits earned during the period$13 $12 $20 $6 $5 $7Interest on obligation142 158 143 71 68 62Amortization of cumulative loss97 94 128 39 16 29Amortization of prior service cost (benefit)1 — 1 (4) (4) (4)Curtailments— — 4 — — —Contractual termination benefits(1) 23 — (1) 2 —Premiums on pension insurance11 12 9 — — —Expected return on assets(194) (193) (189) (30) (33) (33)Net postretirement benefits expense$69 $106 $116 $81 $54 $61Other Changes in plan assets and benefit obligations recognized in other comprehensive loss (income)           Actuarial net loss (gain)$312 $164 $(422) $(7) $326 $(175)Amortization of cumulative loss(97) (94) (128) (39) (16) (29)Prior service benefit— — (1) — — —Amortization of prior service benefit (cost)(1) — (1) 4 4 4Curtailments— — (33) — — —Currency translation— 1 — — — —Total recognized in other comprehensive loss (income)$214 $71 $(585) $(42) $314 $(200)Total net postretirement benefits expense and other comprehensive loss (income)$283 $177 $(469) $39 $368 $(139)In the fourth quarter of 2014, the Company recognized contractual termination charges of $11 million related to our Indianapolis, Indiana foundry facility and our Waukesha, Wisconsin foundry operations.  See Note 3, Restructurings and Impairments for further discussion. Based on a ruling received from the Financial Services Tribunal in Ontario, Canada, in the third quarter of 2014, the Company recognized contractual termination charges of $14 million related to the 2011 closure of its Chatham, Ontario plant.  The Company appealed this ruling, but it was upheld in a July 3, 2015 decision issued by the Divisional Court of Ontario.  On July 23, 2015, the Company filed a notice of motion for leave to appeal to the Court of Appeal for Ontario. The appeal was perfected on August 25, 2015 through an additional filing. These charges were in addition to the previous curtailment and contractual termination charges recognized in the third quarter of 2011.  There was also a remeasurement of the pension plan for hourly employees during the third quarter of 2014.  The discount rate used to measure the pension benefit obligation was 3.8% at remeasurement, compared to 4.1% at October 31, 2013.  As a result of the plan remeasurement, net actuarial gains of $10 million were recognized as a component of Accumulated other comprehensive income (loss) in the third quarter of 2014.  See Note 3, Restructurings and Impairments for further discussion.In the fourth quarter of 2013, the Company made the decision to freeze all benefit accruals for the non-represented participants in the pension plans effective December 31, 2013. The plan freeze resulted in curtailment charges of $4 million and a reduction in the pension obligation of $33 million which was recognized as a component of AOCL. See Note 3, Restructurings and Impairments, for more information on cost-reduction and restructuring activities.The estimated amounts for the defined benefit pension plans and the other postretirement benefit plans that will be amortized from AOCL into net periodic benefit expense over the next fiscal year are as follows: (in millions)Pension Benefits  Health and Life Insurance Benefits Amortization of prior service cost (benefit)$— $(1)Amortization of cumulative losses103 33Cumulative unrecognized actuarial gains and losses for postretirement benefit plans, where substantially all of the plan participants are inactive, are amortized over the average remaining life expectancy of the inactive plan participants. Otherwise, cumulative gains and losses are amortized over the average remaining service period of active employees. Plan amendments unrelated to negotiated labor contracts are amortized over the average remaining service period of active employees or the remaining life expectancy of the inactive participants based upon the nature of the amendment and the participants impacted. Plan amendments arising from negotiated labor contracts are amortized over the length of the contract. Assumptions The weighted average rate assumptions used in determining benefit obligations for the years ended October 31, 2015 and 2014 were:  Pension Benefits Health and Life Insurance Benefits 2015 2014 2015 2014Discount rate used to determine present value of benefit obligation at end of year4.0% 3.7% 4.1% 3.7%Expected rate of increase in future compensation levels3.5% 3.5% — —The weighted average rate assumptions used in determining net postretirement benefits expense for 2015, 2014, and 2013 were:  Pension Benefits Health and Life Insurance Benefits 2015 2014 2013 2015 2014 2013Discount rate3.7% 4.1% 3.2% 3.7% 4.1% 3.4%Expected long-term rate of return on plan assets7.8% 7.8% 8.0% 7.8% 7.8% 8.0%Expected rate of increase in future compensation levels3.5% 3.5% 3.5% — — —The actuarial assumptions used to compute the net postretirement benefits expense (income) are based upon information available as of the beginning of the year, specifically market interest rates, past experience, and our best estimate of future economic conditions. Changes in these assumptions may impact the measurement of future benefit costs and obligations. In computing future costs and obligations, we must make assumptions about such things as employee mortality and turnover, expected salary and wage increases, discount rates, expected returns on plan assets, and expected future cost increases. Three of these items have a significant impact on the level of expense recognized: (i) discount rates, (ii) expected rates of return on plan assets, and (iii) healthcare cost trend rates. We determine the discount rate for our pension and OPEB obligations by matching anticipated future benefit payments for the plans to a high-quality corporate bond yield curve to establish a weighted average discount rate for each plan. We determine our assumption as to expected return on plan assets by evaluating historical performance, investment community forecasts, and current market conditions. We consider the current asset mix as well as our targeted asset mix when establishing the expected return on plan assets. Health care cost trend rates have been established through a review of actual recent cost trends and projected future trends. Our retiree medical and drug cost trend assumptions are our best estimate of expected inflationary increases to healthcare costs. Due to the number of former employees and their beneficiaries included in our retiree population (approximately 35,000), the trend assumptions are based upon both our specific trends and nationally expected trends. The weighted average rate of increase in the per capita cost of postretirement health care benefits provided through U.S. plans representing 91% of our other postretirement benefit obligation, is projected to be 8.2% in 2016 and was estimated as 7.8% for 2015. Our projections assume that the rate will decrease to 5% by the year 2020 and remain at that level each year thereafter. The effect of changing the health care cost trend rate by one-percentage point for each future year is as follows: (in millions)One-PercentagePoint Increase   One-PercentagePoint Decrease  Effect on total of service and interest cost components$12 $(10)Effect on postretirement benefit obligation264 (219)Plan Assets The accounting guidance on fair value measurements specifies a fair value hierarchy based upon the observability of inputs used in valuation techniques (Level 1, 2 and 3). See Note 13, Fair Value Measurements, for a discussion of the fair value hierarchy.The following describes the methods and significant assumptions used to estimate fair value of the investments: •Cash and short-term investments—Valued at cost plus earnings from investments for the period, which approximates fair market value due to the short-term duration. Cash equivalents are valued at net asset value as provided by the administrator of the fund. •U.S. Government and agency securities—Valued at the closing price reported on the active market on which the security is traded or valued by the trustee at year-end using various pricing services of financial institutions, including Interactive Data Corporation, Standard & Poor's and Telekurs. •Corporate debt securities—Valued by the trustee at year-end using various pricing services of financial institutions, including Interactive Data Corporation, Standard & Poor's and Telekurs. •Common and preferred stock—Valued at the closing price reported on the active market on which the security is traded. •Collective trusts, Partnerships/joint venture interests and Hedge funds—Valued at the net asset value provided by the administrator of the fund. The net asset value is based on the value of the underlying assets owned by the fund, minus its liabilities, divided by the number of units outstanding. •Derivatives -Valued monthly for the trustee using various pricing services of financial institutions, including Interactive Data Corporation, Standard & Poor’s and Telekurs. Valued monthly by the trustee using various providers of derivatives pricing, most notably Numerix, Markit and Super Derivatives.The fair value of the pension and other postretirement benefit plan assets by category is summarized below: Pension Assets  2015 2014(in millions)Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 TotalAsset Category               Cash and Cash Equivalents$126 $— $— $126 $112 $— $— $112Equity               U.S. Large Cap209 — — 209 227 — — 227U.S. Small-Mid Cap253 — — 253 313 — — 313Canadian30 — — 30 44 — — 44International216 — — 216 244 — — 244Emerging Markets77 — — 77 108 — — 108Equity derivative— — — — — — (106) (106)Fixed Income               Corporate Bonds— 193 — 193 — 200 — 200Government Bonds— 599 — 599 — 630 — 630Asset Backed Securities— 7 — 7 — 8 — 8Fixed income derivative— — — — — — 1 1Collective Trusts and Other               Common and Preferred Stock— 449 — 449 — 531 — 531Commodities— 21 — 21 — 58 — 58Hedge Funds— — 109 109 — — 106 106Private Equity— — 79 79 — — 94 94Exchange Traded Funds6 — — 6 9 — — 9Mutual Funds29 — — 29 29 — — 29Real Estate— — 1 1 — — 1 1Total(A)$946 $1,269 $189 $2,404 $1,086 $1,427 $96 $2,609___________________(A)For October 31, 2015 and 2014, the totals exclude $8 million and $9 million of receivables, respectively, which are included in the change in plan assets table. In addition, the table above includes the fair value of Canadian pension assets translated at the exchange rates as of October 31, 2015 and 2014, respectively, while the change in plan asset table includes the fair value of Canadian pension assets translated at historical foreign currency rates. The table below presents the changes for those financial instruments classified within Level 3 of the valuation hierarchy for pension assets for the years ended October 31, 2015 and 2014:(in millions)Hedge Funds Private Equity Real Estate Fixed Income Derivative Equity DerivativesBalance at November 1, 2013$101 $103 $1 $(13) $(72)Unrealized gains (losses)5 10 — 14 (43)Realized gains— 15 — — —Purchases, issuances, and settlements— (34) — — 9Balance at October 31, 2014$106 $94 $1 $1 $(106)Unrealized gains (losses)2 — — (1) 138Realized gains1 5 — 8 (165)Purchases, issuances, and settlements— (20) — (8) 133Balance at October 31, 2015$109 $79 $1 $— $—Other Postretirement Benefits 2015 2014(in millions)Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 TotalAsset Category               Cash and Cash Equivalents$29 $— $— $29 $16 $— $— $16Equity               U.S. Large Cap25 — — 25 28 — — 28U.S. Small-Mid Cap42 — — 42 60 — — 60International53 — — 53 60 — — 60Emerging Markets14 — — 14 19 — — 19Fixed Income               Corporate Bonds— 58 — 58 — 55 — 55Government Bonds— 42 — 42 — 49 — 49Asset Backed Securities— 3 — 3 — 3 — 3Collective Trusts and Other               Common Stock— 59 — 59 — 69 — 69Commodities— 1 — 1 — 10 — 10Hedge Funds— — 22 22 — — 22 22Private Equity— — 20 20 — — 23 23Total(A)$163 $163 $42 $368 $183 $186 $45 $414__________________(A)For both October 31, 2015 and 2014, the totals exclude $1 million of receivables, which are included in the change in plan asset table. The table below presents the changes for those financial instruments classified within Level 3 of the valuation hierarchy for other postretirement benefit assets for the years ended October 31, 2015 and 2014:(in millions)Hedge Funds Private EquityBalance at November 1, 2013$21 $26Unrealized gains1 3Realized gains— 4Purchases, issuances, and settlements— (10)Balance at October 31, 2014$22 $23Realized gains— 1Purchases, issuances, and settlements— (4)Balance at October 31, 2015$22 $20The investment strategy of the postretirement pension plans (the "Plans") is based on sound investment practices that emphasize long-term investment fundamentals. The objective of the strategy is to maximize long-term returns consistent with prudent levels of risk. In establishing the investment strategy of the Plans, the following factors were taken into account: (i) the time horizon available for investment, (ii) the nature of the Plan's cash flows and liabilities, and (iii) other factors that affect the Plan's risk tolerance. The strategy is to manage the Plans to achieve fully funded status within the time horizon mandated under Pension Protection Act of 2006 after giving effect to the Preservation of Access to Care for Medicare Beneficiaries, Pension Relief Act of 2010, MAP-21, and HATFA with a prudent amount of risk. As part of that strategy, the Plans are invested in a diversified portfolio across a wide variety of asset classes. This includes areas such as large and small capitalization equities, international and emerging market equities, high quality fixed income, convertible bonds and alternative assets such as commodities, hedge fund of funds, and private equity funds. As a result of our diversification strategies, we believe we have minimized concentrations of risk within the investment portfolios. In February 2012, the Plans entered into a three-year put spread collar hedge covering a majority of the Plans' assets. The hedge provided protection against large equity losses while allowing participation in equity gains up to a limit per annum over the three-year term of the hedge. In addition to the asset hedge, in February 2012, the Plans entered into a three-year zero cost swaption collar. The hedge was designed to protect the liabilities of the Plans against lower interest rates, while allowing participation in the positive benefits that would result if interest rates rise up to a predefined level over the life of the hedge. Given the improvements in the equity markets and changes to the shape of the yield curve, the hedge positions were restructured in March 2013 and May 2014. On February 17, 2015, all hedging strategies discussed above either matured or were unwound.  There are currently no derivative overlay positions in the employee benefit plans.In line with the Plans' return objectives and risk parameters, target asset allocations, which were established following a 2009 asset liability study, are approximately 55% equity investments, 30% fixed income investments, 10% alternative investments (commodities, hedge funds and private equity), and 5% cash. All assets are managed by external investment managers.  Each investment manager is expected to prudently manage the assets in a manner consistent with the investment objectives, guidelines, and constraints outlined in their Investment Management Agreements and the Investment Policy Statement. Managers are not permitted to invest outside of the asset class mandate (e.g., equity, fixed income, alternatives) or strategy for which they are appointed. In July 2013, a portion of the equity portfolio was allocated to index funds.  The areas indexed were the large cap growth and large cap value strategies. Approximately 15% of the Plans' assets were indexed.  Expected Future Benefit Payments The expected future benefit payments for the years ending October 31, 2016 through 2020 and the five years ending October 31, 2025 are estimated as follows:(in millions)Pension Benefit Payments Other Postretirement Benefit Payments(A)2016$304 $1292017298 1212018292 1232019285 1222020280 1212021 through 20251,288 586________________________(A)Payments are net of expected participant contributions and expected federal subsidy receipts. Defined Contribution Plans and Other Contractual ArrangementsOur defined contribution plans cover a substantial portion of domestic salaried employees and certain domestic represented employees. The defined contribution plans contain a 401(k) feature and provide most participants with a matching contribution from the Company. The Company deposits the matching contribution annually. Many participants covered by the plans receive annual Company contributions to their retirement accounts based on an age-weighted percentage of the participant's eligible compensation for the calendar year. Defined contribution expense pursuant to these plans was $29 million in 2015 and $27 million in both 2014 and 2013. In accordance with the 1993 Settlement Agreement, an independent Retiree Supplemental Benefit Trust (the "Supplemental Trust") was established. The Supplemental Trust, and the benefits it provides to certain retirees pursuant to a certain Retiree Supplemental Benefit Program under the 1993 Settlement Agreement ("Supplemental Benefit Program"), is not part of the Company's consolidated financial statements. The Company's contingent profit sharing obligations under a certain Supplemental Benefit Trust Profit Sharing Plan ("Supplemental Benefit Trust Profit Sharing Plan") will continue until certain funding targets defined by the 1993 Settlement Agreement are met. We have recorded no profit sharing accruals based on the operating performance of the entities that are included in the determination of qualifying profits. For more information on pending arbitration regarding the Supplemental Benefit Profit Sharing Plan, see Note 15, Commitments and Contingencies. |

| X                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
+ Details**Name:**us-gaap_CompensationAndRetirementDisclosureAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The entire disclosure for pension and other postretirement benefits.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963
+ Details**Name:**us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock**Namespace Prefix:**us-gaap_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |