| **Finance Receivables, Net (Tables)**                                  | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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| **Finance Receivables, Net [Abstract]**                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Net Financing Receivables                                              | (Dollars in millions)March 31, 2014 March 31, 2013Retail receivables$ 40,216 $ 40,508Pledged retail receivables  9,633   7,669Dealer financing  15,925   14,995   65,774   63,172        Deferred origination (fees) and costs, net  651   634Deferred income  (863)   (794)Allowance for credit losses       Retail and pledged retail receivables  (298)   (338) Dealer financing  (88)   (107)  Total allowance for credit losses  (386)   (445)Finance receivables, net$ 65,176 $ 62,567                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| Contractual Maturities on Retail Receivables and Dealer Financing      | Contractual maturities on retail receivables and dealer financing are as follows (dollars in millions):             Contractual maturities Years ending March 31, Retail receivables Dealer financing2015 $ 14,336 $ 11,3452016   12,719   1,5462017   10,397   1,0202018   7,473   7312019   3,768   806Thereafter   1,150   477Total $ 49,843 $ 15,925                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Finance Receivable Credit Quality Indicators                           | Note 4 - Finance Receivables, Net (Continued)                   The tables below present each credit quality indicator by class of finance receivable as of March 31, 2014 and 2013:                    Retail Loan Commercial      (Dollars in millions)March 31, 2014 March 31, 2013 March 31, 2014 March 31, 2013                         Aging of finance receivables:                  Current$ 48,828 $ 47,236 $ 432 $ 362       30-59 days past due  459   454   6   6       60-89 days past due  90   87   1   1       90 days or greater past due  33   31   -   -      Total$ 49,410 $ 47,808 $ 439 $ 369                           Wholesale Real Estate Working Capital(Dollars in millions)March 31, 2014 March 31, 20131 March 31, 2014 March 31, 2013 March 31, 2014 March 31, 2013                   Credit quality indicators:                  Performing$ 8,129 $ 7,740 $ 3,791 $ 3,968 $ 1,642 $ 1,616 Credit Watch  1,282   915   855   583   158   80 At Risk  24   33   12   28   25   28 Default  1   1   -   1   6   2Total$ 9,436 $ 8,689 $ 4,658 $ 4,580 $ 1,831 $ 1,7261Certain prior period amounts have been reclassified to conform to the current period presentation.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Summary of Investment in Impaired Loans by Class of Finance Receivable | Note 4 – Finance Receivables, Net (Continued) Impaired Finance ReceivablesThe following table summarizes the information related to our impaired loans by class of finance receivable as of March 31, 2014 and 2013:                   Impaired       Individually Evaluated Finance Receivables Unpaid Principal Balance Allowance(Dollars in millions)2014 2013 2014 2013 2014 2013                  Impaired account balances individually evaluated for impairment with an allowance:                      Wholesale$ 13 $ 16 $ 13 $ 16 $ 1 $ 3Real estate  27   33   27   33   8   7Working capital  23   24   23   24   22   23Total$ 63 $ 73 $ 63 $ 73 $ 31 $ 33                  Impaired account balances individually evaluated for impairment without an allowance:                      Wholesale$ 51 $ 66 $ 51 $ 66      Real estate  90   97   90   97      Working capital  4   5   4   5      Total$ 145 $ 168 $ 145 $ 168                        Impaired account balances aggregated and evaluated for impairment:                      Retail loan$ 322 $ 415 $ 318 $ 410      Commercial  1   1   1   1      Total$ 323 $ 416 $ 319 $ 411                        Total impaired account balances:                            Retail loan$ 322 $ 415 $ 318 $ 410      Commercial  1   1   1   1      Wholesale  64   82   64   82      Real estate  117   130   117   130      Working capital  27   29   27   29      Total$ 531 $ 657 $ 527 $ 652        Average Impaired Finance Receivables Interest Income Recognized  Years ended March 31,  Years ended March 31,(Dollars in millions) 2014 2013 2014 2013             Impaired account balances individually evaluated for impairment with an allowance:                   Wholesale $ 16 $ 22 $ - $ -Real estate   32   75   1   1Working capital   24   24   2   1Total $ 72 $ 121 $ 3 $ 2             Impaired account balances individually evaluated for impairment without an allowance:                   Wholesale $ 59 $ 63 $ 1 $ 2Real estate   93   59   4   4Working capital   4   2   -   -Total $ 156 $ 124 $ 5 $ 6             Impaired account balances aggregated and evaluated for impairment:                   Retail loan $ 368 $ 462 $ 27 $ 37Commercial   1   1   -   -Total $ 369 $ 463 $ 27 $ 37             Total impaired account balances:                  Retail loan $ 368 $ 462 $ 27 $ 37Commercial   1   1   -   -Wholesale   75   85   1   2Real estate   125   134   5   5Working capital   28   26   2   1Total $ 597 $ 708 $ 35 $ 45 |

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| - Definition
Tabular disclosure of maturities of an entity's finance receivables as well as any other information pertinent to the receivables.
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No definition available.
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| - Definition
Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.
+ References
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| - Definition
Tabular disclosure of impaired financing receivables.
+ References
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| - Definition
Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.
+ References
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