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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, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
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 $ 1,818 $ 1,242    
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 $ 740 $ 569 $ 649 $ 726
Weighted-average life 4 years 2 months 12 days 4 years 4 months 24 days    
Decline in fair value from 10% adverse change in prepayment rate $ 12 $ 9    
Decline in fair value from 20% adverse change in prepayment rate 21 18    
Decline in fair value from 10% adverse change in interest rate 20 15    
Decline in fair value from 20% adverse change in interest rate 40 31    
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 $ 1,078 $ 673 $ 995 $ 1,257
Weighted-average life 5 years 8 months 12 days 3 years 9 months 18 days    
Decline in fair value from 10% adverse change in prepayment rate $ 46 $ 41    
Decline in fair value from 20% adverse change in prepayment rate $ 89 $ 82    
Spread over the benchmark curve 8.57% 9.22%    
Decline in fair value from 10% adverse change in adjusted spread $ 31 $ 20    
Decline in fair value from 20% adverse change in adjusted spread $ 60 $ 38    
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 0.0549 0.0487    
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 0.1263 0.2113    
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 0.0775 0.0733