v3.25.2
Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights - Key Valuation Assumptions) (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 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 $ 3,467 $ 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 $ 1,010 $ 1,085 $ 1,082 $ 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 31 35    
Decline in fair value from 20% adverse change in interest rate 63 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 $ 2,457 $ 2,626 $ 2,657 $ 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 $ 57 $ 57    
Decline in fair value from 20% adverse change in prepayment rate $ 111 $ 111    
Weighted-average option adjusted spread 7.54% 7.55%    
Decline in fair value from 10% adverse change in adjusted spread $ 77 $ 81    
Decline in fair value from 20% adverse change in adjusted spread $ 150 $ 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 0.0452 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 0.0674 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 0.1077 0.1118