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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, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
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 $ 2,136 $ 1,832    
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 $ 766 $ 668 $ 628 $ 576
Weighted-average life (years) 4 years 2 months 4 years 5 months    
Weighted-average constant prepayment rate 6.36% 8.51%    
Decline in fair value from 10% adverse change in prepayment rate $ 10 $ 12    
Decline in fair value from 20% adverse change in prepayment rate $ 20 $ 23    
Effective discount rate 8.61% 7.81%    
Decline in fair value from 10% adverse change in interest rate $ 21 $ 18    
Decline in fair value from 20% adverse change in interest rate 42 36    
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 $ 1,370 $ 1,164 $ 1,226 $ 1,182
Weighted-average life (years) 7 years 2 months 6 years 5 months    
Weighted-average constant prepayment rate 8.13% 10.04%    
Decline in fair value from 10% adverse change in prepayment rate $ 39 $ 44    
Decline in fair value from 20% adverse change in prepayment rate $ 75 $ 85    
Spread over the benchmark curve 8.20% 8.30%    
Decline in fair value from 10% adverse change in adjusted spread $ 41 $ 35    
Decline in fair value from 20% adverse change in adjusted spread $ 80 $ 67