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Reverse Mortgage Interests - Schedule of Reverse Mortgage Interest (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Reverse Mortgage Interests [Abstract]        
Participating interests in HECM mortgage-backed securities (“HMBS”) $ 3,304 $ 3,471    
Unsecuritized interests 972 964    
Other interests securitized 908 945    
Purchase discount, net (93) (127) $ (129) $ (114)
Total reverse mortgage interests, net $ 5,091 $ 5,253