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Loan Servicing - Analysis of Activity in Residential MSRs (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]    
MSRs, carrying value, beginning balance $ 1,108  
Change in fair value due to changes in valuation inputs or assumptions:    
MSRs, carrying value, ending balance 970  
Residential MSRs    
Servicing Asset at Fair Value, Amount [Roll Forward]    
MSRs, carrying value, beginning balance 957 $ 914
Additions 40 63
Change in fair value due to changes in valuation inputs or assumptions:    
Prepayment speeds (134) 67
OAS 37 17
Servicing costs 0 0
Realization of expected net servicing cash flows, passage of time and other (70) (70)
MSRs, carrying value, ending balance 830 991
Gains (losses) on derivative financial instruments used to mitigate the income statement effect of changes in residential MSR fair value $ 129 $ (84)