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Debt Under Vehicle Programs And Borrowing Arrangements (Schedule Of Contractual Maturities) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]  
Vehicle Program Debt Amount Outstanding $ 7,462
Vehicle backed debt [Member]
 
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]  
Within 1 year 727 [1]
Between 1 and 2 years 2,425
Between 2 and 3 years 1,250
Between 3 and 4 years 1,294
Between 4 and 5 years 843
Thereafter 923
Vehicle Program Debt Amount Outstanding 7,462
Asset-Backed Securities, at Carrying Value 509
Bank-sponsored borrowings $ 218
[1] Vehicle-backed debt maturing within one year includes term asset-backed securities of approximately $509 million and bank and bank-sponsored borrowings of $218 million.