| **Income Tax Provision (Deferred Tax Assets and Liabilities) (Details) (USD $)In Millions, unless otherwise specified** | Mar. 31, 2013 | Mar. 31, 2012 |
|-------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Deferred Tax Assets Liabilities, Net [Line Items]**                                                                   |          |          |
| Net deferred income tax liability                                                                                       | $ 6,236       | $ 5,412       |
| **Tax Liabilities**                                                                                                     |          |          |
| Lease transactions                                                                                                      | 6,509         | 6,379         |
| State Taxes                                                                                                             | 446           | 429           |
| Mark-to-market of investments in marketable securities                                                                  | 210           | 48            |
| Other                                                                                                                   | 295           | 296           |
| Deferred tax liabilities                                                                                                | 7,460         | 7,152         |
| **Tax Assets**                                                                                                          |          |          |
| Provsion for credit and residual value losses                                                                           | 347           | 369           |
| Deferred costs and fees                                                                                                 | 167           | 155           |
| Net operating loss and tax credit carry forwards                                                                        | 679           | 1,168         |
| Other                                                                                                                   | 47            | 52            |
| Deferred tax assets                                                                                                     | 1,240         | 1,744         |
| Valuation Allowance                                                                                                     | (16)          | (4)           |
| Net deferred tax asset                                                                                                  | 1,224         | 1,740         |
| Net deferred income tax liability                                                                                       | 6,236         | 5,412         |
| Federal [Member]                                                                                                        |          |          |
| **Deferred Tax Assets Liabilities, Net [Line Items]**                                                                   |          |          |
| Net deferred income tax liability                                                                                       | 5,763         | 5,009         |
| **Tax Assets**                                                                                                          |          |          |
| Net deferred income tax liability                                                                                       | 5,763         | 5,009         |
| State [Member]                                                                                                          |          |          |
| **Deferred Tax Assets Liabilities, Net [Line Items]**                                                                   |          |          |
| Net deferred income tax liability                                                                                       | 475           | 406           |
| **Tax Assets**                                                                                                          |          |          |
| Net deferred income tax liability                                                                                       | 475           | 406           |
| Foreign [Member]                                                                                                        |          |          |
| **Deferred Tax Assets Liabilities, Net [Line Items]**                                                                   |          |          |
| Net deferred income tax liability                                                                                       | (2)           | (3)           |
| **Tax Assets**                                                                                                          |          |          |
| Net deferred income tax liability                                                                                       | $ (2)         | $ (3)         |

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| - Definition
The sum of the tax effects as of the balance sheet date of the amount of excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset. And the The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.
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The cumulative amount of the estimated future tax effects attributable to temporary differences arising from applying the provisions of the applicable enacted tax laws.
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Amount before allocation of valuation allowances of deferred tax liability to taxable temporary differences.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other provisions, reserves, allowances, and accruals not separately disclosed.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on available-for-sale securities.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.
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