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Fair Value Measurements (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments    
Average pull through percentage used in measuring fair value of interest rate lock commitments (IRLCs) 73.00% 77.00%
Mortgage servicing rights
   
Estimated change in fair value from adverse changes in significant assumptions    
Impact on fair value of 10% adverse change, Weighted-Average Prepayment Speed $ (52)  
Impact on fair value of 20% adverse change, Weighted-Average Prepayment Speed (100)  
Impact on fair value of 10% adverse change, Option Adjusted Spread (60)  
Impact on fair value of 20% adverse change, Option Adjusted Spread (115)  
Impact on fair value of 10% adverse change, Weighted Average Delinquency Rate (25)  
Impact on fair value of 20% adverse change, Weighted Average Delinquency Rate $ (49)