Servicing Activities (Schedule Of Servicing Assets at Fair Value) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Servicing Activities [Abstract]
Estimated fair value, Beginning Balance	$ 2,519	$ 3,738
Additions recognized on sale of mortgage loans	240	622
Additions from purchases of servicing rights	0	31
Subtractions from disposition of servicing assets	0	(266)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	(282)	(1,041)
Servicing Asset at Fair Value, Other Changes in Fair Value	(395)	(565)
Deconsolidation of subsidiary	(1,130)	0
Estimated fair value, Ending Balance	$ 952	$ 2,519

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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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 changes in the inputs, assumptions, or model used to calculate the fair value of servicing assets.

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- Definition

Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties.

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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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