| **Financing Receivables (Details) (USD $)**                                                                                                                                                                                                       | 9 Months Ended |     |               | 12 Months Ended | 9 Months Ended |        |        |               |               |               |               |             |             |             |             |             |             |               |               |             | 9 Months Ended |               | 3 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----|---------------|-----------------|----------------|--------|--------|---------------|---------------|---------------|---------------|-------------|-------------|-------------|-------------|-------------|-------------|---------------|---------------|-------------|----------------|---------------|----------------|
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| **Financing Receivable, Recorded Investment [Line Items]**                                                                                                                                                                                        | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Percent Adverse Change in Assumption                                                                                                                  | Â              |     | Â             |                 | Â              | 10.00% | 20.00% | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Amounts due from sales of receivables                                                                                                                                                                                                             | $ 0            |     | $ 53,000,000  |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Loans and leases receivable, gross, carrying amount                                                                                                                                                                                               | 2,834,000,000  |     | 2,976,000,000 |                 | Â              | Â      | Â      | 1,617,000,000 | 1,917,000,000 | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | 1,217,000,000 | 1,006,000,000 | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Less: Allowance for doubtful accounts                                                                                                                                                                                                             | 39,000,000     |     | 61,000,000    |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Finance receivables, net                                                                                                                                                                                                                          | 2,795,000,000  |     | 2,915,000,000 |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Less: Current portion, net                                                                                                                                                                                                                        | 1,996,000,000  | [1] | 1,770,000,000 | [1]             | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Noncurrent portion, net                                                                                                                                                                                                                           | 799,000,000    |     | 1,145,000,000 |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Facility                                                                                                                                                                                                                                          | Â              |     | Â             |                 | 100,000,000    | Â      | Â      | Â             | Â             | 1,100,000,000 | 1,100,000,000 | 500,000,000 | 500,000,000 | 350,000,000 | 350,000,000 | 250,000,000 | 250,000,000 | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| On-balance sheet assets, net of intercompany balances                                                                                                                                                                                             | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | 3,200,000,000 | 3,300,000,000  | Â | Â | Â | Â |
| Length of agreement                                                                                                                                                                                                                               | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | 3 years | Â | Â | Â |
| Length of potential automatic extension, years                                                                                                                                                                                                    | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | 1 year | Â | Â | Â |
| Operating agreement excess loss, percentage                                                                                                                                                                                                       | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | excess of the first 10% | Â | Â | Â |
| Outstanding finance receivables, off-balance sheet                                                                                                                                                                                                | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | 588,000,000 | 144,000,000 | Â | Â |
| Related originations of outstanding finance receivables, off-balance sheet                                                                                                                                                                        | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | 655,000,000 | 159,000,000 | Â | Â |
| Historical losses on finance receivables, measured as percentage of average balance of related finance receivable                                                                                                                                 | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | 0.30% | 2.10% |
| Financing receivable, by class, number of portfolio segments                                                                                                                                                                                      | 2              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Unutilized funding                                                                                                                                                                                                                                | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | 390,000,000 | 500,000,000 | Â           | Â           | Â           | Â           | Â             | Â             | 39,000,000  | 78,000,000     | Â             | Â              | Â | Â | Â | Â |
| Funding facility collateral, retail accounts                                                                                                                                                                                                      | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | 124,000,000 | 54,000,000     | Â             | Â              | Â | Â | Â | Â |
| Funding facility collateral, cash equivalents                                                                                                                                                                                                     | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | 23,000,000  | 21,000,000     | Â             | Â              | Â | Â | Â | Â |
| Retained interest in off-balance sheet securitizations                                                                                                                                                                                            | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | $ 53,000,000   | Â             | Â              | Â | Â | Â | Â |
| **Key Economic Assumptions [Abstract]**                                                                                                                                                                                                           | Â              |     | Â             |                 | Â              | Â      | Â      | Â             | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Discount rate                                                                                                                                                                                                                                     | Â              |     | Â             |                 | Â              | Â      | Â      | 7.30%         | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Estimated credit losses                                                                                                                                                                                                                           | Â              |     | Â             |                 | Â              | Â      | Â      | 0.00%         | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
| Payment speed (percent of portfolio per month)                                                                                                                                                                                                    | Â              |     | Â             |                 | Â              | Â      | Â      | 88.50%        | Â             | Â             | Â             | Â           | Â           | Â           | Â           | Â           | Â           | Â             | Â             | Â           | Â              | Â             | Â              | Â | Â | Â | Â |
|                                                                                                                                                                                                                                                   |
| [1]The current portion of finance receivables is computed based on contractual maturities. Actual cash collections typically vary from the contractual cash flows because of prepayments, extensions, delinquencies, credit losses, and renewals. |

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Assets Net Of Intercompany Balances
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'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 within one year of the balance sheet date (or the normal operating cycle, whichever is longer).
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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 Receivables Retail Accounts Collateral For Borrowed Securities
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Financing Receivable By Class Number of Portfolio Segments
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Historic Losses On Finance Receivables Measured As Percentage Of Average Balance Of Related Finance Receivable
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Key Economic Assumptions [Abstract]
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Length of Agreement
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Length Of Potential Automatic Extension Years
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Off Balance Sheet Risks Finance Receivables
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Off Balance Sheet Risks Finance Receivables Related Originations
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Operating Agreement Excess Loss Percentage
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Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Percent Adverse Change in Assumption
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| - Definition
The discount rate which is used to value residual cash flows generated by financial assets of the securitization, asset-backed financing arrangement, or similar transfer. This is used as a key assumption in measuring the fair value of assets or liabilities that relate to a transferor's assets obtained or liabilities incurred, if any, at the time of securitization, asset-backed financing, or similar transfer.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The rate at which principal will not be repaid on securitized financial assets, including expected static pool losses. This is used as a key input and assumption in measuring the fair value of assets obtained or liabilities incurred that relate to a transferor's continuing involvement, if any, at the time of securitization, asset-backed financing, or similar transfer.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Estimated speed of prepayments of principal on financial assets. This is used as a key assumption in measuring the fair value of assets obtained or liabilities incurred that relate to a transferor's continuing involvement, if any, at the time of securitization, asset-backed financing, or similar transfer.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.
+ References
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| - Definition
Reflects the aggregate gross carrying amount of all loans and leases held in portfolio, not otherwise categorized (such as commercial, consumer, or foreign), prior to deducting deferred income and the allowance for losses on loans and leases, not otherwise categorized (such as commercial, consumer, or foreign).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5066-111524Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522
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| - Definition
Reflects the aggregate 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.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878
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| - Definition
This includes both the securitized and unsecuritized portion of the total principal amount.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph i(4) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6942082&loc=d3e107314-111719Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B11 -Subparagraph b(1)(b), b(6) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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