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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]    
Mortgage servicing rights, beginning balance $ 1,983  
Mortgage servicing rights, ending balance 1,483  
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 595 766
Unpaid principal balance of loans serviced for others at end of period 203,808 174,664
Servicing Advances 159 193
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (110) (105)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (126) 104
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 29 39
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 76 60
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 888 1,370
Unpaid principal balance of loans serviced for others at end of period 122,886 127,099
Servicing Advances 123 156
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Time and Payoffs [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (117) (130)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Other [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Changes in Fair Value (362) 188
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | From loans sold with servicing retained [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions 23 35
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Purchases [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Additions $ 87 $ 113