| **Investments in Operating Leases, Net (Tables)**   | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Investments in Operating Leases, Net [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Investments in Operating Leases, Net                |       Investments in operating leases, net consisted of the following:      (Dollars in millions)March 31, 2013 March 31, 2012Investments in operating leases$ 25,957 $ 24,911Pledged investments in operating leases  630   -     26,587   24,911Deferred origination (fees) and costs, net  (125)   (133)Deferred income  (609)   (594)Accumulated depreciation  (5,387)   (5,346)Allowance for credit losses  (82)   (95)Investments in operating leases, net$ 20,384 $ 18,743 |
| Future Minimum Lease Rentals on Operating Leases    |    Future minimum lease rentals on operating leases are as follows (dollars in millions):    Future minimum Years ending March 31,rentals on operating leases2014$3,4962015 2,3422016 9432017 1482018 25Thereafter 0Total$6,954   A portion of our operating lease contracts has historically terminated prior to maturity; future minimum rentals as shown above should not be considered as necessarily indicative of total future cash collections.                                                                                                                           |

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| - Definition
Tabular disclosure of future minimum rentals receivables in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future as of the balance sheet date.
+ References
No definition available.
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| - Details**Name:**us-gaap_LeasesOperatingAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
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| - Definition
Tabular disclosure of lessor's property under leasing agreements and property available for lease (not currently under lease) by property class, the gross amount, accumulated depreciation and net amount of  as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 23 -Subparagraph b(i) -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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