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Indebtedness - Summary of Unsecured Senior Notes (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Aug. 01, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |
Unsecured senior notes, net | $ 3,151,000,000 |  | $ 2,673,000,000
Amortization of Debt Discount (Premium) | 5,000,000 |  |
Home Point Capital Inc |  |  |
Debt Instrument [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Senior Note |  | $ 500,000,000 |
Debt Instrument, Unamortized Discount |  | $ 32,000,000 |
Unsecured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | 3,200,000,000 |  | 2,700,000,000
Purchase discount(1) and unamortized debt issuance costs | (49,000,000) |  | (27,000,000)
Unsecured senior notes, net | 3,151,000,000 |  | 2,673,000,000
2026 | 500,000,000 |  |
2027 | 600,000,000 |  |
2028 | 850,000,000 |  |
Unsecured Senior Notes | $850 face value, 5.500% interest rate payable semi-annually, due August 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | 850,000,000 |  | 850,000,000
Face amount | $ 850,000,000 |  |
Interest rate | 5.50% |  |
Unsecured Senior Notes | $650 face value, 5.125% interest rate payable semi-annually, due December 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | $ 650,000,000 |  | 650,000,000
Face amount | $ 650,000,000 |  |
Interest rate | 5.125% |  |
Unsecured Senior Notes | $600 face value, 6.000% interest rate payable semi-annually, due January 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | $ 600,000,000 |  | 600,000,000
Face amount | $ 600,000,000 |  |
Interest rate | 6.00% |  |
Unsecured Senior Notes | $600 face value, 5.750% interest rate payable semi-annually, due November 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | $ 600,000,000 |  | 600,000,000
Face amount | $ 600,000,000 |  |
Interest rate | 5.75% |  |
Unsecured Senior Notes | $550 face value, 5.000% interest rate payable semi-annually, due January 2026(1) |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | $ 500,000,000 |  | $ 0
Face amount | $ 550,000,000 |  |
Interest rate | 5.00% |  |

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