| **Finance Receivables - Finance Receivables (Details) (USD $)**  | 12 Months Ended |
|------------------------------------------------------------------|-----------------|
||
| **Accounts, Notes, Loans and Financing Receivable [Line Items]** |            |   |   |
| Retail Notes And Finance Leases Revenue                          | $ 78,000,000    | $ 98,000,000 | $ 137,000,000 |
| Loans and Leases Receivable Due In One Year                      | 1,641,000,000   |   |   |
| Loans and Leases Receivable, Net Amount                          | 1,900,000,000   | 2,100,000,000 |   |
| Financing Receivable By Class Number of Portfolio Segments       | 2               |   |   |
| Loans and Leases Receivable, Gross, Carrying Amount, Covered     | 1,958,000,000   | 2,176,000,000 |   |
| Less: Allowance for Doubtful accounts                            | 23,000,000      | 27,000,000 |   |
| Total finance receivables, net                                   | 1,935,000,000   | 2,149,000,000 |   |
| Financing Receivable, Recorded Investment, Current               | 1,597,000,000   | 1,663,000,000 |   |
| Finance Receivables, Noncurrent                                  | 338,000,000     | 486,000,000 |   |
| Loans and Leases Receivable Due In Two Years                     | 169,000,000     |   |   |
| Loans and Leases Receivable Due In Three Years                   | 112,000,000     |   |   |
| Loans and Leases Receivable Due In Four Years                    | 55,000,000      |   |   |
| Loans and Leases Receivable Due In Five Years                    | 26,000,000      |   |   |
| Loans and Leases Receivable Due Thereafter                       | 15,000,000      |   |   |
| Finance Receivables Gross                                        | 2,018,000,000   |   |   |
| Loans and Leases Receivable, Deferred Income                     | 60,000,000      |   |   |
| Total finance receivables                                        | 1,958,000,000   |   |   |
| Operating Leases, Income Statement, Lease Revenue                | 75,000,000      | 0 | 0 |
| Finance Revenues From On Balance Sheet Receivables               | 233,000,000     | 259,000,000 | 291,000,000 |
| Revenue from Related Parties                                     | 75,000,000      | 91,000,000 | 91,000,000 |
| Finance revenues                                                 | 158,000,000     | 168,000,000 | 200,000,000 |
| Retail Portfolio [Member]                                        |            |   |   |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]** |            |   |   |
| Loans and Leases Receivable Due In One Year                      | 434,000,000     |   |   |
| Loans and Leases Receivable, Gross, Carrying Amount, Covered     | 751,000,000     | 1,048,000,000 |   |
| Loans and Leases Receivable Due In Two Years                     | 169,000,000     |   |   |
| Loans and Leases Receivable Due In Three Years                   | 112,000,000     |   |   |
| Loans and Leases Receivable Due In Four Years                    | 55,000,000      |   |   |
| Loans and Leases Receivable Due In Five Years                    | 26,000,000      |   |   |
| Loans and Leases Receivable Due Thereafter                       | 15,000,000      |   |   |
| Finance Receivables Gross                                        | 811,000,000     |   |   |
| Loans and Leases Receivable, Deferred Income                     | 60,000,000      |   |   |
| Total finance receivables                                        | 751,000,000     |   |   |
| Wholesale Portfolio [Member]                                     |            |   |   |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]** |            |   |   |
| Loans and Leases Receivable Due In One Year                      | 1,207,000,000   |   |   |
| Loans and Leases Receivable, Gross, Carrying Amount, Covered     | 1,207,000,000   | 1,128,000,000 |   |
| Loans and Leases Receivable Due In Two Years                     | 0               |   |   |
| Loans and Leases Receivable Due In Three Years                   | 0               |   |   |
| Loans and Leases Receivable Due In Four Years                    | 0               |   |   |
| Loans and Leases Receivable Due In Five Years                    | 0               |   |   |
| Loans and Leases Receivable Due Thereafter                       | 0               |   |   |
| Finance Receivables Gross                                        | 1,207,000,000   |   |   |
| Loans and Leases Receivable, Deferred Income                     | 0               |   |   |
| Total finance receivables                                        | 1,207,000,000   |   |   |
| Retail And Wholesale Portfolios [Member]                         |            |   |   |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]** |            |   |   |
| Interest Income, Operating                                       | 27,000,000      | 34,000,000 | 27,000,000 |
| Financial Services Operations [Member]                           |            |   |   |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]** |            |   |   |
| Assets Net Of Intercompany Balances                              | 2,400,000,000   | 2,600,000,000 |   |
| Notes Receivable [Member] | Wholesale Portfolio [Member]         |            |   |   |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]** |            |   |   |
| Interest Income, Operating                                       | 77,000,000      | 87,000,000 | 93,000,000 |
| Off Balance Sheet Securitization Transactions [Member]           |            |   |   |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]** |            |   |   |
| Gain (Loss) on Securitization of Financial Assets                | $ 0             | $ 0 | $ 2,000,000 |

| X                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Assets Net Of Intercompany Balances
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Reflects gross amount of all categories of loans and leases held in portfolio due from customers, clients, lessees, borrowers, or others.
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| - Definition
Reflects carrying amount of all categories of loans and leases held in portfolio, net of unearned income and the allowance for losses on loans and leases, due from customers, clients, lessees, borrowers, or others more than one year from the balance sheet date (or the normal operating cycle, whichever is longer).
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Finance Revenues From On Balance Sheet Receivables
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Financing Receivable By Class Number of Portfolio Segments
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Loans and Leases Receivable Due In Five Years
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Loans and Leases Receivable Due In Four Years
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Loans and Leases Receivable Due In One Year
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Loans and Leases Receivable Due In Three Years
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Loans and Leases Receivable Due In Two Years
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Loans and Leases Receivable Due Thereafter
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| X                                                                                                                                                                                                                                                               |
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Retail Notes And Finance Leases Revenue
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| - Definition
The aggregate financial services revenue and operating interest income earned during the reporting period.
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| - Definition
Financing receivables that are current.
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| - Definition
A gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs.
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| - Definition
Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.
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Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.
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| - Definition
Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.
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| - Definition
Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.
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| - Definition
The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.
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