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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance $ 1,983    
Mortgage servicing rights, ending balance 1,644 $ 1,983  
Mortgage Servicing Rights | Residential Mortgages      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance 1,257 1,164 $ 1,182
Mortgage servicing rights, ending balance 995 1,257 1,164
Unpaid principal balance of loans serviced for others at end of period 120,464 125,388 126,769
Servicing Advances 111 156 201
Mortgage Servicing Rights | Residential Mortgages | Time and Payoffs      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (162) (170) (175)
Mortgage Servicing Rights | Residential Mortgages | Other      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (250) 90 (83)
Mortgage Servicing Rights | Residential Mortgages | From loans sold with servicing retained      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 36 44 55
Mortgage Servicing Rights | Residential Mortgages | Purchases      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 114 129 185
Mortgage Servicing Rights | Commercial Real Estate      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance 726 668 576
Mortgage servicing rights, ending balance 649 726 668
Unpaid principal balance of loans serviced for others at end of period 216,992 180,496 162,182
Servicing Advances 157 220 217
Mortgage Servicing Rights | Commercial Real Estate | Time and Payoffs      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (146) (143) (111)
Mortgage Servicing Rights | Commercial Real Estate | Other      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (87) 51 46
Mortgage Servicing Rights | Commercial Real Estate | From loans sold with servicing retained      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 53 57 88
Mortgage Servicing Rights | Commercial Real Estate | Purchases      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions $ 103 $ 93 $ 69