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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, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
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 $ 2,208 $ 1,818    
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 $ 886 $ 740 $ 701 $ 569
Weighted-average life (years) 4 years 1 month 6 days 4 years 2 months 12 days    
Decline in fair value from 10% adverse change in prepayment rate $ 12 $ 12    
Decline in fair value from 20% adverse change in prepayment rate 21 21    
Decline in fair value from 10% adverse change in interest rate 25 20    
Decline in fair value from 20% adverse change in interest rate 50 40    
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 $ 1,322 $ 1,078 $ 979 $ 673
Weighted-average life (years) 6 years 8 months 12 days 5 years 8 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 $ 79 $ 89    
Spread over the benchmark curve 8.44% 8.57%    
Decline in fair value from 10% adverse change in adjusted spread $ 39 $ 31    
Decline in fair value from 20% adverse change in adjusted spread $ 75 $ 60    
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 0.0496 0.0549    
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 0.0977 0.1263    
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 0.0850 0.0775