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Indebtedness - Advance and Warehouse Facilities Summary (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |
Total advance, warehouse and MSR facilities, net | $ 6,495,000,000 | $ 4,302,000,000
Advance, Warehouse and MSR Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 6,515,000,000 | 4,318,000,000
Collateral Pledged | 14,016,000,000 | 8,781,000,000
Unamortized debt issuance costs | (20,000,000) | (16,000,000)
Total advance, warehouse and MSR facilities, net | $ 6,495,000,000 | $ 4,302,000,000
Warehouse & MSR Facilities |  |
Debt Instrument [Line Items] |  |
Short-Term Debt, Weighted Average Interest Rate, over Time | 7.60% | 7.60%
Servicing | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Short-Term Debt, Weighted Average Interest Rate, over Time | 7.50% | 7.60%
Loans Payable | Servicing | $350 Advance Facility Due October 2026 [Member] | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 350,000,000 |
Outstanding | 119,000,000 | $ 132,000,000
Collateral Pledged | 151,000,000 | 169,000,000
Loans Payable | Servicing | $300 Advance Facility Due November 2024 [Member] | Advance Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 300,000,000 |
Outstanding | 0 | 273,000,000
Collateral Pledged | 0 | 364,000,000
Loans Payable | Servicing | $500 Advance Facility Due August 2026 [Member] | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 423,000,000 | 250,000,000
Collateral Pledged | 475,000,000 | 326,000,000
Loans Payable | Servicing | $500 Advance Facility Due July 2026 [Member] | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 285,000,000 | 0
Collateral Pledged | 394,000,000 | 0
Loans Payable | Servicing | $500 Advance Facility Due July 2026 [Member] | Advance Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Notes Payable to Banks | Servicing | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 849,000,000 | 682,000,000
Collateral Pledged | 1,060,000,000 | 908,000,000
Notes Payable to Banks | Servicing | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 3,650,000,000 | 2,814,000,000
Collateral Pledged | 10,788,000,000 | 6,958,000,000
Notes Payable to Banks | Servicing | $50 Advance facility due July 2025 [Member] | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 50,000,000 |
Notes Payable to Banks | Servicing | $50 Advance facility due July 2025 [Member] | Advance Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 50,000,000 |
Outstanding | 22,000,000 | 27,000,000
Collateral Pledged | 40,000,000 | 49,000,000
Notes Payable to Banks | Servicing | $1750 MSR Warehouse Facility Due April 2026 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,750,000,000 |
Outstanding | 950,000,000 | 980,000,000
Collateral Pledged | 2,669,000,000 | 1,455,000,000
Notes Payable to Banks | Servicing | $1450 MSR Warehouse Facility, Due November 2024 [Member] | MSR Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,450,000,000 |
Outstanding | 0 | 300,000,000
Collateral Pledged | 0 | 2,164,000,000
Notes Payable to Banks | Servicing | $950 MSR Warehouse Facility, Due September 2026 [Member] | MSR Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 950,000,000 |
Outstanding | 550,000,000 | 545,000,000
Collateral Pledged | 1,711,000,000 | 1,306,000,000
Notes Payable to Banks | Servicing | $750 MSR WH Facility due July 2026 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 750,000,000 |
Outstanding | 670,000,000 | 405,000,000
Collateral Pledged | 1,066,000,000 | 655,000,000
Notes Payable to Banks | Servicing | $500 MSR Warehouse Facility due April 2026 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 250,000,000 | 305,000,000
Collateral Pledged | 781,000,000 | 634,000,000
Notes Payable to Banks | Servicing | $500 MSR Warehouse Facility Due June 2026 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 150,000,000 | 250,000,000
Collateral Pledged | 726,000,000 | 677,000,000
Notes Payable to Banks | Servicing | $50 MSR Warehouse Facility Due November 2025 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 50,000,000 |
Outstanding | 25,000,000 | 29,000,000
Collateral Pledged | 80,000,000 | 67,000,000
Notes Payable to Banks | Servicing | $2000 warehouse facility [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 2,000,000,000 |
Notes Payable to Banks | Servicing | $1500 million MSR facility due July 2026 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,500,000,000 |
Outstanding | 475,000,000 | 0
Collateral Pledged | 2,607,000,000 | 0
Notes Payable to Banks | Servicing | $1500 million MSR facility due July 2026 [Member] | MSR Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,500,000,000 |
Notes Payable to Banks | Servicing | $500 MSR WH Facility due June 2026 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 250,000,000 | 0
Collateral Pledged | 519,000,000 | 0
Notes Payable to Banks | Servicing | $500 MSR Warehouse Facility due July 2026 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 330,000,000 | 0
Collateral Pledged | 629,000,000 | 0
Notes Payable to Banks | Originations | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 2,016,000,000 | 822,000,000
Collateral Pledged | 2,168,000,000 | 915,000,000
Notes Payable to Banks | Originations | $1500 Warehouse Facility Due June 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,500,000,000 |
Outstanding | 68,000,000 | 107,000,000
Collateral Pledged | 71,000,000 | 104,000,000
Notes Payable to Banks | Originations | $750 Warehouse Facility Due February 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 750,000,000 |
Outstanding | 112,000,000 | 137,000,000
Collateral Pledged | 140,000,000 | 176,000,000
Notes Payable to Banks | Originations | $750 Warehouse Facility Due October 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 750,000,000 |
Outstanding | 489,000,000 | 155,000,000
Collateral Pledged | 530,000,000 | 166,000,000
Notes Payable to Banks | Originations | $500 Warehouse Facility Due June 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 90,000,000 | 72,000,000
Collateral Pledged | 99,000,000 | 78,000,000
Notes Payable to Banks | Originations | $600 Warehouse Facility Due August 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 600,000,000 |
Outstanding | 368,000,000 | 73,000,000
Collateral Pledged | 381,000,000 | 75,000,000
Notes Payable to Banks | Originations | $1200 Million Warehouse Facility Due September 2026 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,200,000,000 |
Outstanding | 131,000,000 | 158,000,000
Collateral Pledged | 148,000,000 | 177,000,000
Notes Payable to Banks | Originations | $200 Million Warehouse Facility Due December 2026 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 200,000,000 |
Outstanding | 112,000,000 | 82,000,000
Collateral Pledged | 123,000,000 | 84,000,000
Notes Payable to Banks | Originations | $200 Million Warehouse Facility Due July 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 200,000,000 |
Outstanding | 0 | 12,000,000
Collateral Pledged | 0 | 21,000,000
Notes Payable to Banks | Originations | $100 Million Warehouse Facility Due April 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 100,000,000 |
Outstanding | 56,000,000 | 25,000,000
Collateral Pledged | 62,000,000 | 33,000,000
Notes Payable to Banks | Originations | $100 Million WH Facility Due April 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 100,000,000 |
Outstanding | 0 | 0
Collateral Pledged | 0 | 0
Notes Payable to Banks | Originations | $200 Warehouse Facility due July 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 200,000,000 |
Outstanding | 105,000,000 | 1,000,000
Collateral Pledged | 105,000,000 | 1,000,000
Notes Payable to Banks | Originations | $1 Warehouse Facility Due December 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,000,000 |
Outstanding | 0 | 0
Collateral Pledged | 0 | 0
Notes Payable to Banks | Originations | $1200 Warehouse Facility [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,200,000,000 |
Notes Payable to Banks | Originations | $500 Warehouse Facility Due November 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 247,000,000 | 0
Collateral Pledged | 256,000,000 | 0
Notes Payable to Banks | Originations | $250 Warehouse Facility Due November 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 250,000,000 |
Outstanding | 238,000,000 | 0
Collateral Pledged | $ 253,000,000 | $ 0

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