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Servicing Activities (Schedule Of Servicing Assets at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Servicing Activities [Abstract]    
Estimated fair value, Beginning Balance $ 952 $ 2,519
Additions recognized on sale of mortgage loans 54 75
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions (28) 163
Servicing Asset at Fair Value, Other Changes in Fair Value (61) (162)
Estimated fair value, Ending Balance $ 917 $ 2,595