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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance $ 2,000  
Mortgage servicing rights, ending balance 1,800  
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance 726 $ 668
Mortgage servicing rights, ending balance 681 723
Unpaid principal balance of loans serviced for others at end of period 186,946 169,172
Servicing Advances 243 200
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (38) (33)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (33) 48
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 7 17
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 19 23
Mortgage Servicing Rights [Member] | Residential Mortgage [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance 1,257 1,164
Mortgage servicing rights, ending balance 1,131 1,256
Unpaid principal balance of loans serviced for others at end of period 123,079 124,696
Servicing Advances 138 197
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (33) (37)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (106) 107
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 7 13
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 6 $ 9