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Mortgage Servicing Rights (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Changes in fair value of capitalized MSRs      
Balance at beginning of period $ 1,837 $ 1,749 $ 1,194
Rights purchased 35 65 101
Rights Capitalized 619 639 848
Changes in fair value of MSRs      
Due to change in valuation assumptions (586) (249) (15)
Other changes in fair value (386) (367) (379)
Balance at end of period 1,519 1,837 1,749
Up Scenario [Member]
     
Sensitivity to the changes in interest rates of the fair value of the MSRs portfolio and the related derivative instruments      
Net fair value 50 basis points 6 1  
Net fair value 25 basis points 0 5  
Down Scenario [Member]
     
Sensitivity to the changes in interest rates of the fair value of the MSRs portfolio and the related derivative instruments      
Net fair value 50 basis points 21 6  
Net fair value 25 basis points $ 6 $ (5)