| **Debt - Financial Services Operations (Details) (USD $)In Millions, unless otherwise specified**    | 3 Months Ended |        |
|------------------------------------------------------------------------------------------------------|----------------|--------|
||
| **Debt Instrument [Line Items]**                                                                     |           |   |
| Cash Dividends Paid to Parent Company by Consolidated Subsidiaries                                   | $ 30           |   |
| Debt, Current                                                                                        | 1,020          | 1,163  |
| Long-term Debt and Capital Lease Obligations                                                         | 4,184          | 3,922  |
| Financial Services Operations [Member]                                                               |           |   |
| **Debt Instrument [Line Items]**                                                                     |           |   |
| Long-term Debt, net                                                                                  | 2,063          | 1,866  |
| Debt, Current                                                                                        | 766            | 505    |
| Long-term Debt and Capital Lease Obligations                                                         | 1,297          | 1,361  |
| Financial Services Operations [Member] | Secured Debt [Member]                                       |           |   |
| **Debt Instrument [Line Items]**                                                                     |           |   |
| Long-term Debt, net                                                                                  |           | 778    |
| Financial Services Operations [Member] | Line of Credit [Member]                                     |           |   |
| **Debt Instrument [Line Items]**                                                                     |           |   |
| Long-term Debt, net                                                                                  |           | 1,018  |
| Financial Services Operations [Member] | Commercial Paper [Member]                                   |           |   |
| **Debt Instrument [Line Items]**                                                                     |           |   |
| Long-term Debt, net                                                                                  |           | 21     |
| Financial Services Operations [Member] | Borrowings Secured By Operating and Finance Leases [Member] |           |   |
| **Debt Instrument [Line Items]**                                                                     |           |   |
| Long-term Debt, net                                                                                  |           | 49     |
| Revolving Credit Facility [Member] | Bank Facility [Member] | Financial Services Operations [Member] |           |   |
| **Debt Instrument [Line Items]**                                                                     |           |   |
| Line of Credit Facility, Maximum Borrowing Capacity                                                  | $ 100          |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.
+ References
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| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.
+ References
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