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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance $ 1,644    
Mortgage servicing rights, ending balance 1,242 $ 1,644  
Mortgage Servicing Rights | Commercial real estate      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance 649 726 $ 668
Mortgage servicing rights, ending balance 569 649 726
Unpaid principal balance of loans serviced for others at end of period 243,960 216,992 180,496
Servicing Advances 437 157 220
Mortgage Servicing Rights | Commercial real estate | Time and Payoffs      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (115) (146) (143)
Mortgage Servicing Rights | Commercial real estate | Other      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (109) (87) 51
Mortgage Servicing Rights | Commercial real estate | From loans sold with servicing retained      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 100 53 57
Mortgage Servicing Rights | Commercial real estate | Purchases      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 44 103 93
Mortgage Servicing Rights | Residential Mortgages      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance 995 1,257 1,164
Mortgage servicing rights, ending balance 673 995 1,257
Unpaid principal balance of loans serviced for others at end of period 120,778 120,464 125,388
Servicing Advances 143 111 156
Mortgage Servicing Rights | Residential Mortgages | Time and Payoffs      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (198) (162) (170)
Mortgage Servicing Rights | Residential Mortgages | Other      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (377) (250) 90
Mortgage Servicing Rights | Residential Mortgages | From loans sold with servicing retained      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 45 36 44
Mortgage Servicing Rights | Residential Mortgages | Purchases      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions $ 208 $ 114 $ 129