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Fair Value Measurements (Tables)
 12 Months Ended
Mar. 31, 2013
Fair Value Measurements [Abstract]  
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  -  -  4,251
Available-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)  58
Assets 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)$ 9,689

Note 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 4,879
Available-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) 70
Assets 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 net assets (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$ 79
Total 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   -   -   -   -   27
Transfers out of Level 3  -    -   -   -    -    -   -   -   -   -
Fair value, March 31, 2013$ 4$  5$ 51$ 13 $ 73 $ 12$ 55$ (12)$ 55$ 128
The 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 net assets (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$ 75
Total 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   -   -   -   -   21
Transfers out of Level 3  -    -   -   -    -    1  (57)  (1)  (57)  (57)
Fair value, March 31, 2012$ 1$  4$ 15$ 1 $ 21 $ 13$ 69$ (24)$ 58$ 79
The 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 3Value
As 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  7,016

Note 2 - Fair Value Measurements (Continued)    
             
     Fair value measurement hierarchy
   Carrying      Total Fair
(Dollars in millions)valueLevel 1Level 2Level 3Value
As 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