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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance $ 3,423  
Mortgage servicing rights, ending balance 3,455  
Mortgage Servicing Rights | Commercial real estate    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance 1,113 $ 740
Mortgage servicing rights, ending balance 1,106 988
Unpaid principal balance of loans serviced for others at end of period 280,023 281,671
Servicing advances 485 459
Mortgage Servicing Rights | Commercial real estate | Time and Payoffs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (164) (74)
Mortgage Servicing Rights | Commercial real estate | Other    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value 108 262
Mortgage Servicing Rights | Commercial real estate | From loans sold with servicing retained    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 32 35
Mortgage Servicing Rights | Commercial real estate | Purchases    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 17 25
Mortgage Servicing Rights | Residential mortgage loans held for sale    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance 2,310 1,078
Mortgage servicing rights, ending balance 2,349 1,620
Unpaid principal balance of loans serviced for others at end of period 191,274 144,533
Servicing advances 126 143
Mortgage Servicing Rights | Residential mortgage loans held for sale | Time and Payoffs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (113) (123)
Mortgage Servicing Rights | Residential mortgage loans held for sale | Other    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value 33 370
Mortgage Servicing Rights | Residential mortgage loans held for sale | From loans sold with servicing retained    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 10 38
Mortgage Servicing Rights | Residential mortgage loans held for sale | Purchases    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 109 $ 257