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Financial Instruments (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Mar. 31, 2012
Other Quantitative Information    
Finance receivables from related party $ 36 $ 36
Receivables from direct finance leases 220 213
Loans payable to affiliate 0 2,201
Carrying value [Member]
   
Financial liabilities    
Commercial paper 24,173 21,247
Unsecured notes and loans payable 43,165 42,198
Secured notes and loans payable 9,336 9,789
Carrying value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 46,899 44,941
Carrying value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 137 141
Carrying value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 7,816 6,951
Carrying value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,346 4,280
Carrying value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,636 1,480
Fair value [Member]
   
Financial liabilities    
Commercial paper 24,173 21,247
Unsecured notes and loans payable 44,620 43,302
Secured notes and loans payable 9,356 9,810
Fair value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 47,913 46,609
Fair value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 140 148
Fair value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 7,824 6,950
Fair value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,272 4,204
Fair value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,643 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 24,173 21,247
Unsecured notes and loans payable 42,844 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 1,776 6,538
Secured notes and loans payable 9,356 9,810
Fair value [Member] | Level 3 [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 47,913 46,609
Fair value [Member] | Level 3 [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 140 148
Fair value [Member] | Level 3 [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 7,824 6,950
Fair value [Member] | Level 3 [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,272 4,204
Fair value [Member] | Level 3 [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net $ 1,643 $ 1,458