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Goodwill and Mortgage Servicing Rights (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
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 $ 3,686 $ 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 $ 1,032 $ 1,113 $ 740 $ 569
Weighted-average life 3 years 10 months 24 days 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 17 15    
Decline in fair value from 10% adverse change in interest rate 31 34    
Decline in fair value from 20% adverse change in interest rate 61 68    
Mortgage Servicing Rights | Residential Mortgages        
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 $ 2,654 $ 2,310 $ 1,078 $ 673
Weighted-average life 8 years 1 month 6 days 8 years    
Decline in fair value from 10% adverse change in prepayment rate $ 60 $ 55    
Decline in fair value from 20% adverse change in prepayment rate $ 117 $ 107    
Spread over the benchmark curve 7.65% 7.66%    
Decline in fair value from 10% adverse change in adjusted spread $ 83 $ 69    
Decline in fair value from 20% adverse change in adjusted spread $ 161 $ 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 0.0551 0.0428    
Mortgage Servicing Rights | Measurement Input, Constant Prepayment Rate | Residential Mortgages        
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 0.0642 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 0.0964 0.0977