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Reverse Mortgage Interests, Net - Purchase Discount Rollforward (Details) - USD ($)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 31, 2018
Dec. 31, 2019
Discount for Other Interest Securitized      
Balance - beginning of period $ (117)   $ (100)
Utilization of purchase discounts 0   33
Accretion/(Amortization) 17   23
Balance - end of period (100) $ (117) (56)
Discount for Unsecuritized Interests      
Balance - beginning of period (173)   (122)
Utilization of purchase discounts 43   63
Accretion/(Amortization) 8   4
Balance - end of period (122) (173) (68)
Purchase discounts for reverse mortgage interests      
Balance - beginning of period (82) (89) (42)
Additions   (7)  
Accretion   14  
Balance - end of period (42) (82) (46)
Mortgage-backed debt      
Premium for Participating Interests in HMBS      
Balance - beginning of period     58
Balance - end of period 58   10
Participating Interests in HMBS | Mortgage-backed debt      
Premium for Participating Interests in HMBS      
Balance - beginning of period 58   58
Utilization of purchase discounts 0   0
Accretion/(Amortization) 0   49
Balance - end of period $ 58 $ 58 $ 10