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Goodwill and Other Intangible Assets (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Assumption [Line Items]        
Fair Value $ 1,323 $ 1,589    
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member]        
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Assumption [Line Items]        
Fair Value $ 460 $ 526 $ 494 $ 506
Weighted-average life 4 years 7 months 4 years 8 months    
Constant prepayment rate (CPR) 7.30% 5.71%    
Decline in fair value from 10% adverse change in prepayment rate $ 10 $ 10    
Decline in fair value from 20% adverse change in prepayment rate $ 19 $ 19    
Discount rate 7.38% 7.49%    
Decline in fair value from 10% adverse change in interest rate $ 13 $ 14    
Decline in fair value from 20% adverse change in interest rate 26 29    
Mortgage Servicing Rights [Member] | Residential Mortgage [Member]        
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Assumption [Line Items]        
Fair Value $ 863 $ 1,063 $ 839 $ 845
Weighted-average life 4 years 9 months 6 years 4 months    
Constant prepayment rate (CPR) 15.71% 10.61%    
Decline in fair value from 10% adverse change in prepayment rate $ 48 $ 44    
Decline in fair value from 20% adverse change in prepayment rate $ 92 $ 85    
Spread over the benchmark curve 8.82% 8.93%    
Decline in fair value from 10% adverse change in adjusted spread $ 26 $ 34    
Decline in fair value from 20% adverse change in adjusted spread $ 51 $ 67