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Financial Instruments (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Other Quantitative Information    
Finance receivables from related party $ 88 $ 40
Receivables from direct finance leases 231 235
Loans payable to affiliate 0 0
Carrying value [Member]
   
Financial liabilities    
Commercial paper 23,876 24,590
Unsecured notes and loans payable 47,115 47,233
Secured notes and loans payable 7,628 7,009
Carrying value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 47,860 47,312
Carrying value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 140 134
Carrying value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 9,349 8,620
Carrying value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,517 4,531
Carrying value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,726 1,695
Fair value [Member]
   
Financial liabilities    
Commercial paper 23,876 24,590
Unsecured notes and loans payable 48,074 48,775
Secured notes and loans payable 7,627 7,016
Fair value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 48,526 48,313
Fair value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 130 126
Fair value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 9,388 8,644
Fair value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,438 4,480
Fair value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,713 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 23,876 24,590
Unsecured notes and loans payable 47,278 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 796 874
Secured notes and loans payable 7,627 7,016
Fair value [Member] | Level 3 [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 48,526 48,313
Fair value [Member] | Level 3 [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 130 126
Fair value [Member] | Level 3 [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 9,388 8,644
Fair value [Member] | Level 3 [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,438 4,480
Fair value [Member] | Level 3 [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net $ 1,713 $ 1,708