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Financial Instruments (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Other Quantitative Information    
Finance receivables from related party $ 84 $ 40
Receivables from direct finance leases 243 235
Loans payable to affiliate 0 0
Carrying value [Member]
   
Financial liabilities    
Commercial paper 27,517 24,590
Unsecured notes and loans payable 46,894 47,233
Secured notes and loans payable 7,118 7,009
Carrying value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 49,064 47,312
Carrying value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 152 134
Carrying value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 8,466 8,620
Carrying value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,513 4,531
Carrying value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,690 1,695
Fair value [Member]
   
Financial liabilities    
Commercial paper 27,517 24,590
Unsecured notes and loans payable 47,963 48,775
Secured notes and loans payable 7,120 7,016
Fair value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 49,595 48,313
Fair value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 141 126
Fair value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 8,507 8,644
Fair value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,435 4,480
Fair value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,684 1,708
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 27,517 24,590
Unsecured notes and loans payable 47,157 47,901
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 806 874
Secured notes and loans payable 7,120 7,016
Fair value [Member] | Level 3 [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 49,595 48,313
Fair value [Member] | Level 3 [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 141 126
Fair value [Member] | Level 3 [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 8,507 8,644
Fair value [Member] | Level 3 [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,435 4,480
Fair value [Member] | Level 3 [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net $ 1,684 $ 1,708