| **Income Tax Provision (Tables)**                                             | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
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| **Income Tax Provision [Abstract]**                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Provision for Income Taxes                                                    | Note 13 – Income Tax Provision                 The provision for income taxes consisted of the following:           Years ended March 31,(Dollars in millions) 2013  2012  2011Current              Federal$ (15) $ (33) $ (26)      State  41   7   30      Foreign  6   9   10Total current  32   (17)   14Deferred              Federal  721   830   981      State  69   123   151      Foreign  2   1   4Total deferred  792   954   1,136Provision for income taxes$ 824 $ 937 $ 1,150                                                                                                                             |
| Reconciliation Between U.S. Federal Statutory Tax Rate and Effective Tax Rate |           Years ended March 31,  2013  2012  2011 Provision for income taxes at U.S. federal statutory tax rate 35.0%  35.0%  35.0%State and local taxes (net of federal tax benefit) 3.2%  3.4%  3.4%Other - %  0.3%  (0.1)%Effective tax rate 38.2%  38.7%  38.3%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Deferred Federal and State Income Tax Liabilities                             | Note 13 – Income Tax Provision (Continued)      The net deferred income tax liabilities, by tax jurisdiction, are as follows:        March 31, (Dollars in millions) 2013  2012Federal$ 5,763 $ 5,009State  475   406Foreign  (2)   (3)Net deferred income tax liability$ 6,236 $ 5,412                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Deferred Tax Liabilities and Assets                                           | Our net deferred income tax liability consists of the following deferred tax liabilities and assets:        March 31, (Dollars in millions) 2013  2012Liabilities:          Lease transactions$ 6,509 $ 6,379     State taxes  446   429     Mark-to-market of investments in marketable securities   210   48     Other  295   296Deferred tax liabilities$ 7,460 $ 7,152      Assets:          Provision for credit and residual value losses  347   369     Deferred costs and fees  167   155     Net operating loss and tax credit carryforwards  679   1,168     Other  47   52Deferred taxassets  1,240   1,744     Valuation allowance  (16)   (4)Net deferred tax assets$ 1,224 $ 1,740      Net deferred income tax liability$ 6,236 $ 5,412 |
| Change in Unrecognized Tax Benefits                                           |   March 31,(Dollars in millions) 2013  2012  2011Balance at beginning of the period$ 8 $ 6 $ 39    Increases related to positions taken during the prior years  -   2   -    Increases related to positions taken during the current year  1   -   -    Settlements  (2)   -   (33)Balance at end of period$ 7 $ 8 $ 6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |

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| - Definition
Tabular disclosure of the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date.
+ References
No definition available.
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| - Definition
Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319
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| - Definition
Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319
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| - Definition
Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319
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| - Definition
Tabular disclosure of the change in unrecognized tax benefits.
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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=21917533&loc=d3e36027-109320Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319
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