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Indebtedness - Narrative (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |
Loss on repurchase of debt | $ 0 | $ 0 | $ 138 | $ 0
Unsecured Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum percentage redeemable on secured debt |  |  | 40.00% |
Unsecured Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  | $ 100 | $ 100
Amount of principal redeemed |  |  | 2,298 |
Loss on repurchase of debt |  |  | $ 138 |
Minimum | Secured Debt | HECM Securitizations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average useful life |  |  | 1 year |
Maximum | Secured Debt | HECM Securitizations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average useful life |  |  | 3 years |

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