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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance $ 1,644  
Mortgage servicing rights, ending balance 1,082  
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 477 681
Unpaid principal balance of loans serviced for others at end of period 225,769 186,946
Servicing Advances 145 243
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (35) (38)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (167) (33)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 11 7
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 19 19
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 605 1,131
Unpaid principal balance of loans serviced for others at end of period 118,104 123,079
Servicing Advances 99 138
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (39) (33)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (379) (106)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 10 7
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 18 $ 6