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Fair Value of the Servicing Asset Related to Residential Mortgage Loans (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fixed Rate Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Fair value at beginning of period	$ 649	$ 791	$ 667
Fair value at end of period	649	791	667
Adjustable Rate Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Fair value at beginning of period	32	31	32
Fair value at end of period	$ 32	$ 31	$ 32

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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