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Mortgage Servicing Rights - Changes in Fair Value of Capitalized MSRs (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	$ 1,519	$ 1,837	$ 1,749
Rights purchased	42	35	65
Rights capitalized	957	619	639
Changes in fair value of MSRs
Due to fluctuations in market interest rates	(249)	(619)	(255)
Due to revised assumptions or models	(21)	33	6
Other changes in fair value	(548)	(386)	(367)
Balance at end of period	$ 1,700	$ 1,519	$ 1,837

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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