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Indebtedness - Advance and Warehouse Facilities Summary (Details) - USD ($) | Oct. 01, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Advance, warehouse and MSR facilities, net |  | $ 4,379,000,000 |  | $ 4,302,000,000
Advance Facilities | Servicing | Loans payable | $350 advance facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 350,000,000 |  |
Outstanding |  | 113,000,000 |  | 132,000,000
Collateral Pledged |  | 144,000,000 |  | 169,000,000
Advance Facilities | Servicing | Loans payable | $500 advance facility(1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 300,000,000 |  |
Outstanding |  | 0 |  | 273,000,000
Collateral Pledged |  | 0 |  | 364,000,000
Advance Facilities | Servicing | Loans payable | $500 advance facility(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
Outstanding |  | 253,000,000 |  | 250,000,000
Collateral Pledged |  | 285,000,000 |  | 326,000,000
Advance Facilities | Servicing | Loans payable | $30 advance facility(4) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 30,000,000 |  |
Outstanding |  | 27,000,000 |  | 27,000,000
Collateral Pledged |  | 40,000,000 |  | 49,000,000
Advance Facilities | Servicing | Loans payable | $500 Advance Facility Due July 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
Outstanding |  | 211,000,000 |  | 0
Collateral Pledged |  | 304,000,000 |  | 0
Advance Facilities | Servicing | Notes payable to banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding |  | 604,000,000 |  | 682,000,000
Collateral Pledged |  | 773,000,000 |  | 908,000,000
Advance Facilities | Servicing | Notes payable to banks | $30 advance facility(4) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 30,000,000 |  |
Warehouse Facilities | Originations | Notes payable to banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding |  | 1,763,000,000 |  | 822,000,000
Collateral Pledged |  | 1,885,000,000 |  | 915,000,000
Warehouse Facilities | Originations | Notes payable to banks | $500 advance facility(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 | $ 300,000,000 |
Warehouse Facilities | Originations | Notes payable to banks | $1,500 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 1,500,000,000 |  |
Outstanding |  | 61,000,000 |  | 107,000,000
Collateral Pledged |  | 61,000,000 |  | 104,000,000
Warehouse Facilities | Originations | Notes payable to banks | $750 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 750,000,000 |  |
Outstanding |  | 82,000,000 |  | 137,000,000
Collateral Pledged |  | 105,000,000 |  | 176,000,000
Warehouse Facilities | Originations | Notes payable to banks | $750 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 750,000,000 |  |
Outstanding |  | 530,000,000 |  | 155,000,000
Collateral Pledged |  | 558,000,000 |  | 166,000,000
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
Outstanding |  | 72,000,000 |  | 72,000,000
Collateral Pledged |  | 75,000,000 |  | 78,000,000
Warehouse Facilities | Originations | Notes payable to banks | $350 warehouse facility(6) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 350,000,000 |  |
Outstanding |  | 276,000,000 |  | 73,000,000
Collateral Pledged |  | 282,000,000 |  | 75,000,000
Warehouse Facilities | Originations | Notes payable to banks | $350 warehouse facility(6) | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount | $ 600,000,000 |  |  |
Warehouse Facilities | Originations | Notes payable to banks | $1,200 warehouse facility(5) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 1,200,000,000 |  |
Outstanding |  | 426,000,000 |  | 158,000,000
Collateral Pledged |  | 473,000,000 |  | 177,000,000
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 200,000,000 |  |
Outstanding |  | 180,000,000 |  | 82,000,000
Collateral Pledged |  | 186,000,000 |  | 84,000,000
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 200,000,000 |  |
Outstanding |  | 0 |  | 12,000,000
Collateral Pledged |  | 0 |  | 21,000,000
Warehouse Facilities | Originations | Notes payable to banks | $100 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 100,000,000 |  |
Outstanding |  | 80,000,000 |  | 25,000,000
Collateral Pledged |  | 89,000,000 |  | 33,000,000
Warehouse Facilities | Originations | Notes payable to banks | $100 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 100,000,000 |  |
Outstanding |  | 0 |  | 0
Collateral Pledged |  | 0 |  | 0
Warehouse Facilities | Originations | Notes payable to banks | $100 warehouse facility (4) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 100,000,000 |  |
Outstanding |  | 56,000,000 |  | 1,000,000
Collateral Pledged |  | 56,000,000 |  | 1,000,000
Warehouse Facilities | Originations | Notes payable to banks | $1 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 1,000,000 |  |
Outstanding |  | 0 |  | 0
Collateral Pledged |  | 0 |  | 0
Warehouse Facilities | Originations | Notes payable to banks | $1,200 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 1,200,000,000 |  |
MSR Facilities | Servicing | Notes payable to banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding |  | 2,035,000,000 |  | 2,814,000,000
Collateral Pledged |  | 9,101,000,000 |  | 6,958,000,000
MSR Facilities | Servicing | Notes payable to banks | $1750 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 2,000,000,000 |  |
MSR Facilities | Servicing | Notes payable to banks | $950 million MSR facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 950,000,000 |  |
Outstanding |  | 155,000,000 |  | 545,000,000
Collateral Pledged |  | 1,287,000,000 |  | 1,306,000,000
MSR Facilities | Servicing | Notes payable to banks | $1,750 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 1,750,000,000 |  |
Outstanding |  | 550,000,000 |  | 980,000,000
Collateral Pledged |  | 2,463,000,000 |  | 1,455,000,000
MSR Facilities | Servicing | Notes payable to banks | $1,500 warehouse facility(1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 1,450,000,000 |  |
Outstanding |  | 0 |  | 300,000,000
Collateral Pledged |  | 0 |  | 2,164,000,000
MSR Facilities | Servicing | Notes payable to banks | $500 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
Outstanding |  | 100,000,000 |  | 405,000,000
Collateral Pledged |  | 722,000,000 |  | 655,000,000
MSR Facilities | Servicing | Notes payable to banks | $500 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
Outstanding |  | 250,000,000 |  | 305,000,000
Collateral Pledged |  | 740,000,000 |  | 634,000,000
MSR Facilities | Servicing | Notes payable to banks | $500 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
Outstanding |  | 150,000,000 |  | 250,000,000
Collateral Pledged |  | 745,000,000 |  | 677,000,000
MSR Facilities | Servicing | Notes payable to banks | $50 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 50,000,000 |  |
Outstanding |  | 10,000,000 |  | 29,000,000
Collateral Pledged |  | 78,000,000 |  | 67,000,000
MSR Facilities | Servicing | Notes payable to banks | $500 warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
Outstanding |  | 250,000,000 |  | 0
Collateral Pledged |  | 501,000,000 |  | 0
MSR Facilities | Servicing | Notes payable to banks | $1500 million MSR facility due July 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 1,500,000,000 |  |
Outstanding |  | 470,000,000 |  | 0
Collateral Pledged |  | 2,212,000,000 |  | 0
MSR Facilities | Servicing | Notes payable to banks | $500 MSR WH Mizuho Facility Due July 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
Outstanding |  | 100,000,000 |  | 0
Collateral Pledged |  | 353,000,000 |  | 0
Advance Financing, Internally Allocated | Servicing | Loans payable | $500 advance facility(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 500,000,000 |  |
MSR Financing, Internally Allocated | Servicing | Notes payable to banks | $950 million MSR facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 950,000,000 |  |
MSR Financing, Internally Allocated | Servicing | Notes payable to banks | $1500 million MSR facility due July 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity Amount |  | 1,500,000,000 |  |
Advance, Warehouse and MSR Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding |  | 4,402,000,000 |  | 4,318,000,000
Collateral Pledged |  | 11,759,000,000 |  | 8,781,000,000
Unamortized debt issuance costs |  | (23,000,000) |  | (16,000,000)
Advance, warehouse and MSR facilities, net |  | $ 4,379,000,000 |  | $ 4,302,000,000

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