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Intangible Assets - Residential MSRs Activity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair value of MSRs:
Beginning balance	$ 187	$ 363	$ 220	$ 394
Additions related to loan sales	6	7	20	32
Changes in fair value due to:
Change in valuation inputs or assumptions used in the valuation models	(5)	(110)	(20)	(132)
Realization of cash flows	(15)	(23)	(47)	(57)
Ending balance	$ 173	$ 237	$ 173	$ 237

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

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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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- Definition

The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, assumptions, or model used to calculate the fair value of servicing assets.

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