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Loan Servicing (Analysis of Activity in Residential Mortgage Servicing Rights) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Loan Servicing [Abstract]      
Carrying value, beginning balance $ 563 $ 830 $ 832
Additions 270 225 265
Prepayment speeds 19 (284) (66)
Weighted Average AOS (36) (20) (28)
Servicing costs (22) (30) (44)
Other 7 (7) 0
Other changes (174) [1] (151) [1] (129) [1]
Carrying value, ending balance 627 563 830
Gains (losses) on derivative financial instruments used to mitigate the income statement effect of changes in fair value $ 128 $ 394 $ 196
[1] Represents the realization of expected net servicing cash flows, expected borrower payments and the passage of time.