Debt Under Vehicle Programs And Borrowing Arrangements (Schedule Of Contractual Maturities) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Vehicle Program Debt Amount Outstanding	$ 7,999
Vehicle backed debt [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Within 1 year	1,131	[1]
Between 1 and 2 years	2,218
Between 2 and 3 years	1,571
Between 3 and 4 years	902
Between 4 and 5 years	1,601
Thereafter	576
Vehicle Program Debt Amount Outstanding	7,999
Asset-Backed Securities, at Carrying Value	952
Bank-sponsored borrowings	$ 179

[1] Vehicle-backed debt maturing within one year includes term asset-backed securities of approximately $952 million and bank and bank-sponsored borrowings of $179 million.