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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights - Key Valuation Assumptions) (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 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 $ 3,455 $ 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 $ 1,106 $ 1,113 $ 988 $ 740
Weighted-average life (years) 3 years 10 months 24 days 4 years    
Decline in fair value from 10% adverse change in prepayment rate $ 7 $ 8    
Decline in fair value from 20% adverse change in prepayment rate 14 15    
Decline in fair value from 10% adverse change in interest rate 33 34    
Decline in fair value from 20% adverse change in interest rate 65 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 $ 2,349 $ 2,310 $ 1,620 $ 1,078
Weighted-average life (years) 7 years 9 months 18 days 8 years    
Decline in fair value from 10% adverse change in prepayment rate $ 56 $ 55    
Decline in fair value from 20% adverse change in prepayment rate $ 108 $ 107    
Spread over the benchmark curve 7.67% 7.66%    
Decline in fair value from 10% adverse change in adjusted spread $ 69 $ 69    
Decline in fair value from 20% adverse change in adjusted spread $ 135 $ 134    
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 0.0438 0.0428    
Mortgage Servicing Rights | Measurement Input, 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 0.0691 0.0672    
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 0.0989 0.0977