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Goodwill and Other Intangible Assets (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 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 $ 1,222,000,000 $ 1,589,000,000    
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 $ 448,000,000 $ 526,000,000 $ 543,000,000 $ 506,000,000
Weighted-average life 4 years 6 months 4 years 8 months    
Constant prepayment rate (CPR) 8.19% 5.71%    
Decline in fair value from 10% adverse change in prepayment rate $ 10,000,000 $ 10,000,000    
Decline in fair value from 20% adverse change in prepayment rate $ 19,000,000 $ 19,000,000    
Discount rate 7.44% 7.49%    
Decline in fair value from 10% adverse change in interest rate $ 12,000,000 $ 14,000,000    
Decline in fair value from 20% adverse change in interest rate 24,000,000 29,000,000    
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 $ 774,000,000 $ 1,063,000,000 $ 1,015,000,000 $ 845,000,000
Weighted-average life 4 years 1 month 6 years 4 months    
Constant prepayment rate (CPR) 19.19% 10.61%    
Decline in fair value from 10% adverse change in prepayment rate $ 50,000,000 $ 44,000,000    
Decline in fair value from 20% adverse change in prepayment rate $ 95,000,000 $ 85,000,000    
Spread over the benchmark curve 8.65% 8.93%    
Decline in fair value from 10% adverse change in adjusted spread $ 23,000,000 $ 34,000,000    
Decline in fair value from 20% adverse change in adjusted spread $ 44,000,000 $ 67,000,000