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Activity Related to the MSR Portfolio (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Servicing Assets at Fair Value [Line Items]
Gain Loss On Sale Of Securities Net Economic Hedge Servicing Rights		$ 5
Changes Fair Value Of Free Standing Derivatives	4	(27)
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ 11	$ 37

The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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