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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, 2019 | Dec. 31, 2017 | Nov. 30, 2009
Debt Instrument [Line Items] |  |  |  |  |
Repurchase of unsecured senior notes | $ 1,030 | $ 62 | $ 100 | $ 123 |
Maximum percentage redeemable on secured debt |  |  | 35.00% |  |
Principal amount outstanding on securitized financing |  |  |  |  | $ 222
Non-recourse debt | 6,795 |  | $ 5,286 |  |
Legacy Asset |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Non-recourse debt | 29 |  | $ 0 |  |
Other Nonrecourse Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unpaid principal outstanding on securitized financing | 29 |  |  |  |
Non-recourse debt | 29 |  |  |  |
New Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum percentage redeemable on secured debt |  |  | 40.00% |  |
Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of principal redeemed | 658 |  | $ 100 |  |
Repayment of debt | 364 |  |  |  |
Repurchase of unsecured senior notes |  | 60 |  |  |
Loss on repurchase of debt |  | $ 2 |  |  |
Secured Debt | Legacy Asset |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  |  |  | 7.50%
Securities Pledged as Collateral |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount outstanding on securitized financing | $ 160 |  |  |  |
Minimum | Other Nonrecourse Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 1.90% |  |
Minimum | Secured Debt | HECM Securitizations |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 2.30% |  |
Weighted average useful life |  |  | 1 year |  |
Maximum | Other Nonrecourse Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 5.70% |  |
Maximum | Secured Debt | HECM Securitizations |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 6.00% |  |
Weighted average useful life |  |  | 3 years |  |

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