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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights - Key Valuation Assumptions) (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
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 $ 3,503 $ 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 $ 975 $ 1,032 $ 1,169 $ 1,113
Weighted-average life (years) 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 15 17    
Decline in fair value from 10% adverse change in interest rate 30 31    
Decline in fair value from 20% adverse change in interest rate 61 61    
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 $ 2,528 $ 2,654 $ 2,837 $ 2,310
Weighted-average life (years) 7 years 9 months 18 days 8 years 1 month 6 days    
Decline in fair value from 10% adverse change in prepayment rate $ 61 $ 60    
Decline in fair value from 20% adverse change in prepayment rate $ 119 $ 117    
Weighted-average option adjusted spread 7.55% 7.65%    
Decline in fair value from 10% adverse change in adjusted spread $ 78 $ 83    
Decline in fair value from 20% adverse change in adjusted spread $ 151 $ 161    
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 0.0441 0.0551    
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 0.0721 0.0642    
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 0.1069 0.0964