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Reverse Mortgage Interests - Schedule of Revers Mortgage Interests, Net (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 01, 2018
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Reverse Mortgage Interest [Abstract] |  |  |  |
Participating interests in HECM mortgage-backed securities | $ 3,471 | $ 4,282 |  |
Unsecuritized interests | 964 | 1,117 |  |
Other interests securitized | 945 | 994 |  |
Purchase discount, net | (127) | (114) | $ (164) | $ (256)
Total reverse mortgage interests, net | $ 5,253 | $ 6,279 |  |

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- Definition Reverse funded loan advances + References No definition available. + Details
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- Definition Reverse Mortgage Interest [Abstract] + References No definition available. + Details
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- Definition Reverse Mortgage Interest Subject to Non-Recourse Debt + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Net + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized + References No definition available. + Details
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