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Indebtedness - Narrative (Details) - USD ($) $ in Millions | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Nov. 30, 2009
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchase of unsecured senior notes | $ 0 |  |  |  |  |  |  |
Principal amount outstanding on securitized financing |  |  |  |  |  |  |  | $ 222
Non-recourse debt | 7,165 | $ 7,165 |  |  | $ 7,165 |  |  |
Minimum tangible net worth | 682 | 682 |  |  | 682 |  |  |
Securities Pledged as Collateral |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount outstanding on securitized financing | 165 | 165 |  |  | $ 165 |  | $ 181 |
New Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum percentage redeemable on unsecured debt |  |  |  |  | 40.00% |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum percentage redeemable on unsecured debt |  |  |  |  | 35.00% |  |  |
Nonrecourse debt–legacy assets |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying value on loans outstanding | 32 | 32 |  |  | $ 32 |  | 42 |
Non-recourse debt | 32 | $ 32 |  |  | $ 32 |  | $ 37 |
Unsecured Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount of principal redeemed | 659 |  |  |  |  |  |  |
Repayment of debt | $ 364 |  |  |  |  |  |  |
Repurchase of unsecured senior notes |  |  | $ 26 | $ 60 |  | $ 120 |  |
Loss on repurchase of debt |  |  | $ 1 | $ 2 |  | $ 3 |  |
Secured Debt | Nonrecourse debt–legacy assets |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | 7.50% | 7.50% |  |  | 7.50% |  |  |
Minimum | Nonrecourse debt–legacy assets |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | 2.40% | 2.40% |  |  | 2.40% |  |  |
Minimum | Secured Debt | HECM Securitizations |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | 2.00% | 2.00% |  |  | 2.00% |  |  |
Weighted average useful life |  | 1 year |  |  |  |  |  |
Maximum | Nonrecourse debt–legacy assets |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | 7.00% | 7.00% |  |  | 7.00% |  |  |
Maximum | Secured Debt | HECM Securitizations |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | 6.50% | 6.50% |  |  | 6.50% |  |  |
Weighted average useful life |  | 3 years |  |  |  |  |  |

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