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Fair Value of the Servicing Asset Related to Residential Mortgage Loans (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Fixed Rate Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Fair value at beginning of period	$ 645	$ 649	$ 630	$ 791
Fair value at end of period	645	649	630	791
Adjustable Rate Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Fair value at beginning of period	34	32	32	31
Fair value at end of period	$ 34	$ 32	$ 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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