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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, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
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 of servicing rights $ 3,711 $ 3,686    
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 of servicing rights $ 1,085 $ 1,032 $ 1,113 $ 740
Weighted-average life 3 years 9 months 18 days 3 years 10 months 24 days    
Decline in fair value from 10% adverse change in prepayment rate $ 8 $ 9    
Decline in fair value from 20% adverse change in prepayment rate 16 17    
Decline in fair value from 10% adverse change in interest rate 35 31    
Decline in fair value from 20% adverse change in interest rate 69 61    
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 of servicing rights $ 2,626 $ 2,654 $ 2,310 $ 1,078
Weighted-average life 8 years 8 years 1 month 6 days    
Decline in fair value from 10% adverse change in prepayment rate $ 57 $ 60    
Decline in fair value from 20% adverse change in prepayment rate $ 111 $ 117    
Spread over the benchmark curve 7.55% 7.65%    
Decline in fair value from 10% adverse change in adjusted spread $ 81 $ 83    
Decline in fair value from 20% adverse change in adjusted spread $ 157 $ 161    
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 0.0445 0.0551    
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 0.0639 0.0642    
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 0.1118 0.0964