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Fair Value Measurements (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments    
Average pull through percentage used in measuring fair value of interest rate lock commitments 74.00% 74.00%
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 $ (33)  
Impact on fair value of 20% adverse change, Weighted-Average Prepayment Speed (64)  
Impact on fair value of 10% adverse change, Option Adjusted Spread (41)  
Impact on fair value of 20% adverse change, Option Adjusted Spread (78)  
Impact on fair value of 10% adverse change, Weighted Average Delinquency Rate (21)  
Impact on fair value of 20% adverse change, Weighted Average Delinquency Rate $ (43)