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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance $ 1,644  
Mortgage servicing rights, ending balance 1,067  
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 490 630
Unpaid principal balance of loans serviced for others at end of period 228,985 193,510
Servicing Advances 285 204
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (61) (75)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (166) (88)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 45 16
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 23 51
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 577 997
Unpaid principal balance of loans serviced for others at end of period 122,043 124,461
Servicing Advances 92 128
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (82) (77)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (419) (262)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 22 14
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 61 $ 65