| **Summary of Significant Accounting Policies (Tables)** | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Accounting Policies [Abstract]**                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Product Warranty Liability                              | The following table presents accrued product warranty and deferred warranty revenue activity:  Six Months Ended April 30,(in millions)2013 2012Balance at beginning of period$1,118 $598Costs accrued and revenues deferred226 236Adjustments to pre-existing warranties(A)(B)204 227Payments and revenues recognized(327) (217)Balance at end of period1,221 844Less: Current portion647 365Noncurrent accrued product warranty and deferred warranty revenue$574 $479_________________________(A)Adjustments to pre-existing warranties reflect changes in our estimate of warranty costs for products sold in prior periods. Such adjustments typically occur when claims experience deviates from historic and expected trends. Our warranty liability is generally affected by component failure rates, repair costs, and the timing of failures. Future events and circumstances related to these factors could materially change our estimates and require adjustments to our liability. In addition, new product launches require a greater use of judgment in developing estimates until historical experience becomes available. Inthe first quarter of 2013, we recorded adjustments for changes in estimates of $40 million, or $0.50 per diluted share. Inthe second quarter of 2013, we recorded adjustments for changes in estimates of $164 million, or $2.04 per diluted share. The impact of income taxes on the 2013 adjustments are not material due to our deferred tax valuation allowances on our U.S. deferred tax assets. In the first quarter of 2012, adjustments for changes in estimates amounted to $123 million, $119 million net of tax or $1.70 per diluted share.  In the second quarter of 2012, we recorded adjustments for changes in estimates of $104 million, $100 million net of tax or $1.46.  The impact of income taxes on the 2012 adjustments reflect the Company's 2012 estimated annual effective tax rate as of April 30, 2012.(B)In the first quarter of 2013, we recognized $13 million of charges for adjustments to pre-existing warranties for a specific warranty issue related to component parts from a supplier. Also during the quarter, we reached agreement for reimbursement from this supplier for this amount and other costs previously accrued. As a result of this agreement, we recognized a recovery of $27 million within Costs of products sold and recorded a receivable within Other current assets. In the second quarter of 2013, we recognized a warranty recovery of $13 million within Loss from discontinued operations, net of tax and recorded a receivable within Other current assets. |

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| - Definition
Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249
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