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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]      
Mortgage servicing rights, beginning balance $ 1,832    
Mortgage servicing rights, ending balance 1,983 $ 1,832  
Mortgage Servicing Rights | Residential Mortgage      
Servicing Assets at Fair Value [Line Items]      
Mortgage servicing rights, beginning balance 1,164 1,182 $ 1,063
Mortgage servicing rights, ending balance 1,257 1,164 1,182
Unpaid principal balance of loans serviced for others at end of period 125,388 126,769 125,381
Servicing Advances 156 201 302
Mortgage Servicing Rights | Residential Mortgage | Time and Payoffs      
Servicing Assets at Fair Value [Line Items]      
Changes in Fair Value (170) (175) (168)
Mortgage Servicing Rights | Residential Mortgage | Other      
Servicing Assets at Fair Value [Line Items]      
Changes in Fair Value 90 (83) 37
Mortgage Servicing Rights | Residential Mortgage | From loans sold with servicing retained      
Servicing Assets at Fair Value [Line Items]      
Additions 44 55 62
Mortgage Servicing Rights | Residential Mortgage | Purchases      
Servicing Assets at Fair Value [Line Items]      
Additions 129 185 188
Mortgage Servicing Rights | Commercial Real Estate      
Servicing Assets at Fair Value [Line Items]      
Mortgage servicing rights, beginning balance 668 576 526
Mortgage servicing rights, ending balance 726 668 576
Unpaid principal balance of loans serviced for others at end of period 180,496 162,182 143,139
Servicing Advances 220 217 265
Mortgage Servicing Rights | Commercial Real Estate | Time and Payoffs      
Servicing Assets at Fair Value [Line Items]      
Changes in Fair Value (143) (111) (92)
Mortgage Servicing Rights | Commercial Real Estate | Other      
Servicing Assets at Fair Value [Line Items]      
Changes in Fair Value 51 46 45
Mortgage Servicing Rights | Commercial Real Estate | From loans sold with servicing retained      
Servicing Assets at Fair Value [Line Items]      
Additions 57 88 61
Mortgage Servicing Rights | Commercial Real Estate | Purchases      
Servicing Assets at Fair Value [Line Items]      
Additions $ 93 $ 69 $ 36