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Financial Instruments (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Other Quantitative Information    
Finance receivables from related party $ 36 $ 36
Receivables from direct finance leases 211 213
Loans payable to affiliate 0 2,201
Real estate [Member]
   
Financial assests    
Finance receivables, net   4,280
Carrying value [Member]
   
Financial liabilities    
Commercial paper 24,634 21,247
Unsecured notes and loans payable 41,114 42,198
Secured notes and loans payable 9,484 9,789
Carrying value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 45,608 44,941
Carrying value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 141 141
Carrying value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 7,963 6,951
Carrying value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,321  
Carrying value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,620 1,480
Fair value [Member]
   
Financial liabilities    
Commercial paper 24,634 21,247
Unsecured notes and loans payable 42,567 43,302
Secured notes and loans payable 9,493 9,810
Fair value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 46,542 46,609
Fair value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 145 148
Fair value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 7,966 6,950
Fair value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,249 4,204
Fair value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,624 1,458
Fair value [Member] | Level 1 [Member]
   
Financial liabilities    
Commercial paper 0 0
Unsecured notes and loans payable 0 0
Secured notes and loans payable 0 0
Fair value [Member] | Level 1 [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 1 [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 1 [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 1 [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 1 [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 2 [Member]
   
Financial assests    
Finance receivables, net   0
Financial liabilities    
Commercial paper 24,634 21,247
Unsecured notes and loans payable 38,266 36,764
Secured notes and loans payable 0 0
Fair value [Member] | Level 2 [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 2 [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 2 [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 2 [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 0 0
Fair value [Member] | Level 2 [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 0  
Fair value [Member] | Level 3 [Member]
   
Financial liabilities    
Commercial paper 0 0
Unsecured notes and loans payable 4,301 6,538
Secured notes and loans payable 9,493 9,810
Fair value [Member] | Level 3 [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 46,542 46,609
Fair value [Member] | Level 3 [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 145 148
Fair value [Member] | Level 3 [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 7,966 6,950
Fair value [Member] | Level 3 [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,249 4,204
Fair value [Member] | Level 3 [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net $ 1,624 $ 1,458