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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights - Key Valuation Assumptions) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
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 $ 3,564 $ 3,711    
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 $ 1,041 $ 1,085 $ 1,075 $ 1,032
Weighted-average life (years) 3 years 9 months 18 days 3 years 9 months 18 days    
Decline in fair value from 10% adverse change in prepayment rate $ 8 $ 8    
Decline in fair value from 20% adverse change in prepayment rate 16 16    
Decline in fair value from 10% adverse change in interest rate 32 35    
Decline in fair value from 20% adverse change in interest rate 65 69    
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 $ 2,523 $ 2,626 $ 2,687 $ 2,654
Weighted-average life (years) 7 years 9 months 18 days 8 years    
Decline in fair value from 10% adverse change in prepayment rate $ 58 $ 57    
Decline in fair value from 20% adverse change in prepayment rate $ 112 $ 111    
Weighted-average option adjusted spread 7.55% 7.55%    
Decline in fair value from 10% adverse change in adjusted spread $ 78 $ 81    
Decline in fair value from 20% adverse change in adjusted spread $ 152 $ 157    
Mortgage Servicing Rights | 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 0.0456 0.0445    
Mortgage Servicing Rights | 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 0.0668 0.0639    
Mortgage Servicing Rights | 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 0.1092 0.1118