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Mortgage Servicing Rights (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Up Scenario [Member]
Dec. 31, 2011
Up Scenario [Member]
Mar. 31, 2012
Down Scenario [Member]
Dec. 31, 2011
Down Scenario [Member]
Changes in fair value of capitalized MSRs            
Balance at beginning of period $ 1,519 $ 1,837        
Rights purchased 13 7        
Rights Capitalized 261 213        
Changes in fair value of MSRs            
Due to change in valuation assumptions 65 102        
Other changes in fair value (121) (86)        
Balance at end of period 1,737 2,073        
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     23 6 23 21
Net fair value 25 basis points     $ 6   $ 4 $ 6