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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance $ 3,686  
Mortgage servicing rights, ending balance 3,762  
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 1,075 1,061
Unpaid principal balance of loans serviced for others at end of period 286,922 281,179
Servicing advances 537 470
Mortgage Servicing Rights | Commercial real estate | Time and Payoffs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (79) (82)
Mortgage Servicing Rights | Commercial real estate | Other    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value 107 9
Mortgage Servicing Rights | Commercial real estate | From loans sold with servicing retained    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 3 13
Mortgage Servicing Rights | Commercial real estate | Purchases    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 12 8
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 2,687 2,232
Unpaid principal balance of loans serviced for others at end of period 206,544 187,748
Servicing advances 149 137
Mortgage Servicing Rights | Residential mortgage loans held for sale | Time and Payoffs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (57) (53)
Mortgage Servicing Rights | Residential mortgage loans held for sale | Other    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value 72 (48)
Mortgage Servicing Rights | Residential mortgage loans held for sale | From loans sold with servicing retained    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 5 5
Mortgage Servicing Rights | Residential mortgage loans held for sale | Purchases    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 13 $ 18