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Indebtedness - Narrative (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Jul. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2018 | Nov. 30, 2009
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchase of unsecured senior notes |  | $ 0 |  |  | $ 0 |  |
Repayment of outstanding debt |  | 658,000,000 |  |  |  |  |
Principal amount outstanding on securitized financing |  |  |  |  |  |  | $ 222,000,000
Non-recourse debt |  |  | $ 5,533,000,000 |  | 5,533,000,000 | $ 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 |  |  |  |  |  | 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 |  |  |  |  |  | 29,000,000 |
Non-recourse debt |  |  |  |  |  | $ 29,000,000 |
Unsecured Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchase of unsecured senior notes |  | 0 | $ 0 |  | $ 0 |  |
Repayment of outstanding debt |  | $ 364,000,000 |  |  |  |  |
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 |  |  | 2.30% |  | 2.30% |  |
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 |  |  | 5.90% |  | 5.90% |  |
Maximum | Secured Debt | HECM Securitizations |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 6.00% |  | 6.00% |  |
Weighted average useful life |  |  |  |  | 4 years |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchase of unsecured senior notes |  |  |  | $ 62,000,000 |  |  |
Nationstar Mortgage Holdings Inc. | Unsecured Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchase of unsecured senior notes | $ 0 |  |  | 60,000,000 |  |  |
Loss on repurchase of debt |  |  |  | $ 2,000,000 |  |  |

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