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Sales of Receivables and Servicing Rights - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale
Sevicing of residential mortgage loans for other investors	$ 64,800,000,000	$ 62,500,000,000
Carry Value Of Loans Leases Or Lines Of Credit Securitized	509,000,000
Fair value of automobile loan securitization servicing asset	$ 6,000,000

This is the principal amount outstanding for securitized loans only (across all types of loans).

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- Definition

Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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