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Loan Servicing (Analysis of Activity in Residential Mortgage Servicing Rights) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Loan Servicing [Abstract]
Carrying value, beginning balance	$ 627	$ 563
Additions	269	195
Prepayment speeds	244	(16)
Weighted Average OAS	(48)	(36)
Servicing costs	(21)	(22)
Realization of the expected net servicing cash flows	(115)	(121)
Carrying value, ending balance	956	563
Gains (losses) on derivative financial instruments used to mitigate the income statement effect of changes in fair value	$ (149)	$ 148

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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