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Financial Instruments (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Other Quantitative Information    
Finance receivables from related party $ 40 $ 36
Receivables from direct finance leases 235 213
Loans payable to affiliate 0 2,201
Carrying value [Member]
   
Financial liabilities    
Commercial paper 24,590 21,247
Unsecured notes and loans payable 47,233 42,198
Secured notes and loans payable 7,009 9,789
Carrying value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 47,312 44,941
Carrying value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 134 141
Carrying value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 8,620 6,951
Carrying value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,531 4,280
Carrying value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,695 1,480
Fair value [Member]
   
Financial liabilities    
Commercial paper 24,590 21,247
Unsecured notes and loans payable 48,775 43,302
Secured notes and loans payable 7,016 9,810
Fair value [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 48,313 46,609
Fair value [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 126 148
Fair value [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 8,644 6,950
Fair value [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,480 4,204
Fair value [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net 1,708 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 liabilities    
Commercial paper 24,590 21,247
Unsecured notes and loans payable 47,901 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 0
Fair value [Member] | Level 3 [Member]
   
Financial liabilities    
Commercial paper 0 0
Unsecured notes and loans payable 874 6,538
Secured notes and loans payable 7,016 9,810
Fair value [Member] | Level 3 [Member] | Retail Loan [Member]
   
Financial assests    
Finance receivables, net 48,313 46,609
Fair value [Member] | Level 3 [Member] | Commercial [Member]
   
Financial assests    
Finance receivables, net 126 148
Fair value [Member] | Level 3 [Member] | Wholesale [Member]
   
Financial assests    
Finance receivables, net 8,644 6,950
Fair value [Member] | Level 3 [Member] | Real estate [Member]
   
Financial assests    
Finance receivables, net 4,480 4,204
Fair value [Member] | Level 3 [Member] | Working capital [Member]
   
Financial assests    
Finance receivables, net $ 1,708 $ 1,458