| **Fair Value Measurements (Tables)**                                                     | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| **Fair Value Measurements [Abstract]**                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis               |               As of March 31, 2013     Fair value measurements on a recurring basis           Counterparty Fair(Dollars in millions) Level 1 Level 2 Level 3netting & collateral value Cash equivalents:           Money market instruments$ 900$ 608$ -$ -$ 1,508 Certificates of deposit  -  1,945  -  -  1,945 Commercial paper  -  798  -  -  798 Cash equivalents total  900  3,351  -  -  4,251Available-for-sale securities:           Debt instruments:            U.S. government and agency obligations  42  62  -  -  104  Municipal debt securities  -  16  -  -  16  Certificates of deposit  -  2,041  -  -  2,041  Commercial paper  -  495  -  -  495  Foreign government debt securities  -  3  -  -  3  Corporate debt securities  -  124  4  -  128  Mortgage-backed securities:             U.S. government agency  -  87  -  -  87   Non-agency residential  -  -  5  -  5   Non-agency commercial  -  -  51  -  51  Asset-backed securities  -  -  13  -  13 Equity instruments:            Fixed income mutual funds:             Short-term sector fund  -  43  -  -  43   U.S. government sector fund  -  312  -  -  312   Municipal sector fund  -  22  -  -  22   Investment grade corporate sector fund  -  327  -  -  327   High-yield sector fund  -  42  -  -  42   Real return sector fund  -  293  -  -  293   Mortgage sector fund  -  648  -  -  648   Asset-backed securities sector fund  -  47  -  -  47   Emerging market sector fund  -  66  -  -  66   International sector fund  -  170  -  -  170  Equity mutual fund  484  -  -  -  484 Available-for-sale securities total  526  4,798  73  -  5,397 Derivative assets:             Foreign currency swaps  -  1,076  63  -  1,139  Interest rate swaps  -  568  12  -  580  Counterparty netting and collateral  -  -  -  (1,661)  (1,661) Derivative assets total  -  1,644  75  (1,661)  58Assets at fair value  1,426  9,793  148  (1,661)  9,706 Derivative liabilities:            Foreign currency swaps  -  (123)  (8)  -  (131)  Interest rate swaps  -  (766)  -  -  (766)  Counterparty netting and collateral  -  -  -  892  892 Derivative liabilities total  -  (889)  (8)  892  (5) Embedded derivative liabilities   -  -  (12)  -  (12)Liabilities at fair value   -  (889)  (20)  892  (17)Net assets at fair value$ 1,426$ 8,904$ 128$ (769)$ 9,689Note 2 – Fair Value Measurements (Continued)                    As of March 31, 2012                  Fair value measurements on a recurring basis          CounterpartyFair(Dollars in millions) Level 1 Level 2 Level 3netting & collateralvalue Cash equivalents:           Money market instruments$2,591$256$0$0$2,847 Certificates of deposit 0 495 0 0 495 Commercial paper 0 1,537 0 0 1,537 Cash equivalents total 2,591 2,288 0 0 4,879Available-for-sale securities:           Debt instruments:            U.S. government and agency obligations 0 108 0 0 108  Municipal debt securities 0 20 0 0 20  Certificates of deposit 0 1,341 0 0 1,341  Commercial paper 0 633 0 0 633  Foreign government debt securities 0 3 0 0 3  Corporate debt securities 0 106 1 0 107  Mortgage-backed securities:             U.S. government agency 0 105 0 0 105   Non-agency residential 0 4 4 0 8   Non-agency commercial 0 11 15 0 26  Asset-backed securities 0 12 1 0 13 Equity instruments:            Fixed income mutual funds:             Short-term sector fund 0 40 0 0 40   U.S. government sector fund 0 313 0 0 313   Municipal sector fund 0 21 0 0 21   Investment grade corporate sector fund 0 298 0 0 298   High-yield sector fund 0 37 0 0 37   Real return sector fund 0 231 0 0 231   Mortgage sector fund 0 639 0 0 639   Asset-backed securities sector fund 0 41 0 0 41   Emerging market sector fund 0 62 0 0 62   International sector fund 0 162 0 0 162  Equity mutual fund 451 0 0 0 451 Available-for-sale securities total 451 4,187 21 0 4,659 Derivative assets:             Foreign currency swaps 0 2,142 79 0 2,221  Interest rate swaps 0 426 13 0 439  Counterparty netting and collateral 0 0 0 (2,590) (2,590) Derivative assets total 0 2,568 92 (2,590) 70Assets at fair value 3,042 9,043 113 (2,590) 9,608 Derivative liabilities:            Foreign currency swaps 0 (63) (10) 0 (73)  Interest rate swaps 0 (1,008) 0 0 (1,008)  Counterparty netting and collateral 0 0 0 1,038 1,038 Derivative liabilities total 0 (1,071) (10) 1,038 (43) Embedded derivative liabilities  0 0 (24) 0 (24)Liabilities at fair value 0 (1,071) (34) 1,038 (67)Net assets at fair value$3,042$7,972$79$(1,552)$9,541                                                 |
| Assets and Liabilities Measured on Recurring Basis Using Significant Unobservable Inputs | Year Ended March 31, 2013                             Fair Value Measurements Using Significant Unobservable Inputs (Level 3)   Available-for-sale securities DerivativesTotal netassets(liabilities)     Non-agencyNon-agency                     residentialcommercial   Total      Total      Corporatemortgage-mortgage-Asset- available- InterestForeign Embeddedderivative     debtbackedbackedbacked for-sale  rate currency derivatives,assets  (Dollars in millions) securities securities securities securities  securities swapsswaps net(liabilities)  Fair value, April 1, 2012$ 1$  4$ 15$ 1 $ 21 $ 13$ 69$ (24)$ 58$ 79Total gains                         Included in earnings  -     -    -    -     -     2  11  12  25  25  Included in other                         comprehensive income  -     -    -    -     -     -    -    -    -    -  Purchases, issuances, sales, and                         settlements                         Purchases  -     2  35  7   44   -    -    -    -    44  Issuances  -     -    -    -     -     -    -    -    -    -    Sales  -     (2)  (4)  (1)   (7)   -    -    -    -    (7)  Settlements  -     (2)  (5)  (5)   (12)   (3)  (25)  -    (28)  (40)Transfers in to Level 3  3  3 10  11   27   -    -    -    -    27Transfers out of Level 3  -     -    -    -     -     -    -    -    -    -  Fair value, March 31, 2013$ 4$  5$ 51$ 13 $ 73 $ 12$ 55$ (12)$ 55$ 128The amount of total gains                           for the period included                       in earnings attributable to the                       change in unrealized gains or                       losses related to assets still held                       at the reporting date             $ 2$ 8$ 1$ 11$ 11                          Note 2 – Fair Value Measurements (Continued)                          Year Ended March 31, 2012                             Fair Value Measurements Using Significant Unobservable Inputs (Level 3)   Available-for-sale securities DerivativesTotal netassets(liabilities)     Non-agency Non-agency                      residential commercial   Total       Total     Corporatemortgage-mortgage- Asset- available- Interest Foreign Embeddedderivative     debtbacked backed  backed for-sale  rate  currency derivatives,assets  (Dollars in millions)securitiessecuritiessecurities  securities  securities swaps swaps net(liabilities) Fair value, April 1, 2011$ -  $  -  $ -  $ -   $ -   $ 17$ 109$ (51)$ 75$ 75Total gains                         Included in earnings  -     -    -    -     -     11  47  28  86  86  Included in other                         comprehensive income  -     -    -    -     -     -    -    -    -    -  Purchases, issuances, sales, and                         settlements                         Purchases  -     -    -    -     -     -    -    -    -    -    Issuances  -     -    -    -     -     -    -    -    -    -    Sales  -     -    -    -     -     -    -    -    -    -    Settlements  -     -    -    -     -     (16)  (30)  -    (46)  (46)Transfers in to Level 3  1   4  15  1   21   -    -    -    -    21Transfers out of Level 3  -     -    -    -     -     1  (57)  (1)  (57)  (57)Fair value, March 31, 2012$ 1$  4$ 15$ 1 $ 21 $ 13$ 69$ (24)$ 58$ 79The amount of total gains or                           (losses) for the period included                       in earnings attributable to the                       change in unrealized gains or                       losses related to assets still held                       at the reporting date             $ 7$ 43$ (4)$ 46$ 46                           |
| Carrying Value of Certain Financial Instruments                                          |      Fair value measurement hierarchy   Carrying      Total Fair(Dollars in millions)valueLevel 1Level 2Level 3ValueAs of March 31, 2013                       Financial assets           Finance receivables, net            Retail loan$ 47,312$ -  $ -  $ 48,313$ 48,313  Commercial  134  -    -    126  126  Wholesale  8,620  -    -    8,644  8,644  Real estate  4,531  -    -    4,480  4,480  Working capital  1,695  -    -    1,708  1,708             Financial liabilities           Commercial paper$ 24,590$ -  $ 24,590$ -  $ 24,590 Unsecured notes and loans payable  47,233  -    47,901  874  48,775 Secured notes and loans payable  7,009  -    -    7,016  7,016Note 2 - Fair Value Measurements (Continued)                      Fair value measurement hierarchy   Carrying      Total Fair(Dollars in millions)valueLevel 1Level 2Level 3ValueAs of March 31, 2012                       Financial assets           Finance receivables, net            Retail loan$ 44,941$ -  $ -  $ 46,609$ 46,609  Commercial  141  -    -    148  148  Wholesale  6,951  -    -    6,950  6,950  Real estate  4,280  -    -    4,204  4,204  Working capital  1,480  -    -    1,458  1,458             Financial liabilities           Commercial paper$ 21,247$ -  $ 21,247$ -  $ 21,247 Unsecured notes and loans payable  42,198  -    36,764  6,538  43,302 Secured notes and loans payable  9,789  -    -    9,810  9,810                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| - Definition
Tabular disclosure of the fair value measurement of total net assets (liabilities) using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liability.
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| - Definition
Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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