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Fair Value of the Servicing Asset Related to Residential Mortgage Loans (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fixed Rate Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Fair value at beginning of period	$ 664	$ 649	$ 791
Fair value at end of period	664	649	791
Adjustable Rate Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Fair value at beginning of period	33	32	31
Fair value at end of period	$ 33	$ 32	$ 31

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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