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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Reverse MSRs and Liabilities - Amortized Cost (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Fair value - end of period $ 3,109  
Servicing Liability at Amortized Cost [Roll Forward]    
Servicing liability at amortized cost, beginning balance 61  
Servicing liability at amortized cost, ending balance 53  
Reverse mortgage servicing rights    
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Servicing asset at amortized cost, beginning balance 6 $ 11
Servicing asset, amortization 0 0
Servicing asset, adjustments 0 (4)
Servicing asset at amortized cost, ending balance 6 7
Fair value - end of period 6 7
Mortgage servicing rights financing    
Servicing Liability at Amortized Cost [Roll Forward]    
Servicing liability at amortized cost, beginning balance 61 71
Servicing liability, amortization/accretion (8) (18)
Servicing liability, adjustments 0 37
Servicing liability at amortized cost, ending balance 53 90
Fair value - end of period $ 27 $ 75