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Loan Servicing - Analysis of Activity in Residential MSRs (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]    
MSRs, carrying value, beginning balance $ 1,056  
Change in fair value due to changes in valuation inputs or assumptions:    
MSRs, carrying value, ending balance 1,179  
Residential MSRs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
MSRs, carrying value, beginning balance 914 $ 915
Additions 96 93
Change in fair value due to changes in valuation inputs or assumptions:    
Prepayment speeds 47 (56)
OAS 70 47
Servicing costs 0 9
Realization of expected net servicing cash flows, passage of time and other (104) (104)
MSRs, carrying value, ending balance 1,023 904
Gains (losses) on derivative financial instruments used to mitigate the income statement effect of changes in residential MSR fair value $ (119) $ 12