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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, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 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 $ 4,006 $ 3,423    
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 $ 1,169 $ 1,113 $ 1,132 $ 740
Weighted-average life (years) 4 years 4 years    
Decline in fair value from 10% adverse change in prepayment rate $ 9 $ 8    
Decline in fair value from 20% adverse change in prepayment rate 18 15    
Decline in fair value from 10% adverse change in interest rate 36 34    
Decline in fair value from 20% adverse change in interest rate 73 68    
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 $ 2,837 $ 2,310 $ 2,074 $ 1,078
Weighted-average life (years) 8 years 4 months 24 days 8 years    
Decline in fair value from 10% adverse change in prepayment rate $ 58 $ 55    
Decline in fair value from 20% adverse change in prepayment rate $ 112 $ 107    
Spread over the benchmark curve 7.65% 7.66%    
Decline in fair value from 10% adverse change in adjusted spread $ 89 $ 69    
Decline in fair value from 20% adverse change in adjusted spread $ 173 $ 134    
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 0.0542 0.0428    
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 0.0577 0.0672    
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 0.1022 0.0977