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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance $ 3,686  
Mortgage servicing rights, ending balance 3,739  
Mortgage Servicing Rights | Commercial real estate    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance 1,032 $ 1,113
Mortgage servicing rights, ending balance 1,082 1,106
Unpaid principal balance of loans serviced for others at end of period 288,746 280,023
Servicing advances 578 485
Mortgage Servicing Rights | Commercial real estate | Time and Payoffs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (157) (164)
Mortgage Servicing Rights | Commercial real estate | Other    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value 172 108
Mortgage Servicing Rights | Commercial real estate | From loans sold with servicing retained    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 11 32
Mortgage Servicing Rights | Commercial real estate | Purchases    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 24 17
Mortgage Servicing Rights | Residential mortgage loans held for sale    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance 2,654 2,310
Mortgage servicing rights, ending balance 2,657 2,349
Unpaid principal balance of loans serviced for others at end of period 203,543 191,274
Servicing advances 132 126
Mortgage Servicing Rights | Residential mortgage loans held for sale | Time and Payoffs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (126) (113)
Mortgage Servicing Rights | Residential mortgage loans held for sale | Other    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value 88 33
Mortgage Servicing Rights | Residential mortgage loans held for sale | From loans sold with servicing retained    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 12 10
Mortgage Servicing Rights | Residential mortgage loans held for sale | Purchases    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 29 $ 109