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Goodwill and Mortgage Servicing Rights (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
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 $ 1,242 $ 1,644    
Mortgage Servicing Rights | Commercial real estate        
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 $ 569 $ 649 $ 726 $ 668
Weighted-average life 4 years 4 months 24 days 4 years 1 month 6 days    
Decline in fair value from 10% adverse change in prepayment rate $ 9 $ 9    
Decline in fair value from 20% adverse change in prepayment rate 18 17    
Decline in fair value from 10% adverse change in interest rate 15 17    
Decline in fair value from 20% adverse change in interest rate 31 34    
Mortgage Servicing Rights | Residential Mortgages        
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 $ 673 $ 995 $ 1,257 $ 1,164
Weighted-average life 3 years 9 months 18 days 5 years 2 months 12 days    
Decline in fair value from 10% adverse change in prepayment rate $ 41 $ 46    
Decline in fair value from 20% adverse change in prepayment rate $ 82 $ 89    
Spread over the benchmark curve 9.22% 7.69%    
Decline in fair value from 10% adverse change in adjusted spread $ 20 $ 27    
Decline in fair value from 20% adverse change in adjusted spread $ 38 $ 52    
Mortgage Servicing Rights | Measurement Input, Constant Prepayment Rate | Commercial real estate        
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]        
Servicing asset, measurement input 0.0487 0.0456    
Mortgage Servicing Rights | Measurement Input, Constant Prepayment Rate | Residential Mortgages        
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]        
Servicing asset, measurement input 0.2113 0.1351    
Mortgage Servicing Rights | Measurement Input, Discount Rate | Commercial real estate        
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]        
Servicing asset, measurement input 0.0733 0.0791