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Indebtedness - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Nov. 30, 2009
Debt Instrument [Line Items] |  |  |  |  |  |
Repurchase of unsecured senior notes |  |  | $ 0 | $ 62,000,000 |  |
Principal amount outstanding on securitized financing |  |  |  |  |  | $ 222,000,000
Non-recourse debt | $ 5,985,000,000 |  | 5,985,000,000 |  | $ 6,795,000,000 |
Minimum tangible net worth | 682,000,000 |  | 682,000,000 |  |  |
Securities Pledged as Collateral |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount outstanding on securitized financing | 151,000,000 |  | $ 151,000,000 |  | 160,000,000 |
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 | 22,000,000 |  | $ 22,000,000 |  | 29,000,000 |
Non-recourse debt | 22,000,000 |  | 22,000,000 |  | $ 29,000,000 |
Unsecured Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repurchase of unsecured senior notes | $ 0 | $ 44,000,000 | $ 0 | 60,000,000 |  |
Loss on repurchase of debt |  | $ 1,000,000 |  | $ 2,000,000 |  |
Secured Debt | Nonrecourse debt–legacy assets |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 7.50% |  | 7.50% |  |  |
Minimum | Nonrecourse debt–legacy assets |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 2.718% |  | 2.718% |  |  |
Minimum | Secured Debt | HECM Securitizations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 2.70% |  | 2.70% |  |  |
Weighted average useful life |  |  | 1 year |  |  |
Maximum | Nonrecourse debt–legacy assets |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 5.97% |  | 5.97% |  |  |
Maximum | Secured Debt | HECM Securitizations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 6.00% |  | 6.00% |  |  |
Weighted average useful life |  |  | 4 years |  |  |

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