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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
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 $ 1,680 $ 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 $ 701 $ 569 $ 477 $ 649
Weighted-average life (years) 4 years 8 months 12 days 4 years 4 months 24 days    
Decline in fair value from 10% adverse change in prepayment rate $ 11 $ 9    
Decline in fair value from 20% adverse change in prepayment rate 22 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 mortgage loans held for sale        
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 $ 979 $ 673 $ 605 $ 995
Weighted-average life (years) 6 years 2 months 12 days 3 years 9 months 18 days    
Decline in fair value from 10% adverse change in prepayment rate $ 38 $ 41    
Decline in fair value from 20% adverse change in prepayment rate $ 79 $ 82    
Spread over the benchmark curve 9.44% 9.22%    
Decline in fair value from 10% adverse change in adjusted spread $ 34 $ 20    
Decline in fair value from 20% adverse change in adjusted spread $ 66 $ 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 0.0487 0.0487    
Mortgage Servicing Rights | Measurement Input, Constant Prepayment Rate | Residential mortgage loans held for sale        
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 0.1072 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 0.0739 0.0733