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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance $ 1,644  
Mortgage servicing rights, ending balance 1,113  
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance 649 $ 726
Mortgage servicing rights, ending balance 515 595
Unpaid principal balance of loans serviced for others at end of period 234,897 203,808
Servicing Advances 363 159
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (87) (110)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (143) (126)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 65 29
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 31 76
Mortgage Servicing Rights [Member] | Residential Mortgage [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance 995 1,257
Mortgage servicing rights, ending balance 598 888
Unpaid principal balance of loans serviced for others at end of period 119,158 122,886
Servicing Advances 107 123
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (136) (117)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (408) (362)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 34 23
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 113 $ 87