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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
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 $ 1,854 $ 1,758    
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 $ 628 $ 576 $ 473 $ 526
Weighted-average life (years) 4 years 6 months 4 years 7 months    
Weighted-average constant prepayment rate 8.48% 8.61%    
Decline in fair value from 10% adverse change in prepayment rate $ 12 $ 11    
Decline in fair value from 20% adverse change in prepayment rate $ 23 $ 21    
Effective discount rate 7.61% 7.52%    
Decline in fair value from 10% adverse change in interest rate $ 17 $ 16    
Decline in fair value from 20% adverse change in interest rate 33 31    
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 $ 1,226 $ 1,182 $ 820 $ 1,063
Weighted-average life (years) 6 years 4 months 24 days 6 years 10 months    
Weighted-average constant prepayment rate 10.23% 9.41%    
Decline in fair value from 10% adverse change in prepayment rate $ 49 $ 45    
Decline in fair value from 20% adverse change in prepayment rate $ 94 $ 86    
Spread over the benchmark curve 8.27% 8.50%    
Decline in fair value from 10% adverse change in adjusted spread $ 37 $ 37    
Decline in fair value from 20% adverse change in adjusted spread $ 72 $ 72