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Indebtedness - Advance and Warehouse Facilities Summary (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Total advance, warehouse and MSR facilities, net | $ 4,302,000,000 | $ 2,885,000,000
Advance, Warehouse and MSR Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 4,318,000,000 | 2,896,000,000
Collateral Pledged | 8,781,000,000 | 7,262,000,000
Unamortized debt issuance costs | (16,000,000) | (11,000,000)
Total advance, warehouse and MSR facilities, net | $ 4,302,000,000 | $ 2,885,000,000
Warehouse & MSR Facilities |  |
Debt Instrument [Line Items] |  |
Short-Term Debt, Weighted Average Interest Rate, over Time | 7.60% | 4.00%
Servicing | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Short-Term Debt, Weighted Average Interest Rate, over Time | 7.60% | 4.10%
Loans Payable | Servicing | $350 Advance Facility Due October 2024 [Member] | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 350,000,000 |
Outstanding | 132,000,000 | $ 150,000,000
Collateral Pledged | 169,000,000 | 189,000,000
Loans Payable | Servicing | $300 Advance Facility Due November 2024 [Member] | Advance Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 300,000,000 |
Outstanding | 273,000,000 | 308,000,000
Collateral Pledged | 364,000,000 | 410,000,000
Loans Payable | Servicing | $250 Advance Facility Due September 2025 [Member] | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 250,000,000 |
Outstanding | 250,000,000 | 171,000,000
Collateral Pledged | 326,000,000 | 209,000,000
Notes Payable to Banks | Servicing | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 682,000,000 | 669,000,000
Collateral Pledged | 908,000,000 | 853,000,000
Notes Payable to Banks | Servicing | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 2,814,000,000 | 1,410,000,000
Collateral Pledged | 6,958,000,000 | 5,499,000,000
Notes Payable to Banks | Servicing | $50 Advance facility due December 2024 [Member] | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 50,000,000 |
Outstanding | 27,000,000 | 40,000,000
Collateral Pledged | 49,000,000 | 45,000,000
Notes Payable to Banks | Servicing | $1500 MSR Warehouse Facility Due April 2025 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,500,000,000 |
Outstanding | 980,000,000 | 260,000,000
Collateral Pledged | 1,455,000,000 | 2,284,000,000
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 | 300,000,000 | 380,000,000
Collateral Pledged | 2,164,000,000 | 927,000,000
Notes Payable to Banks | Servicing | $750 MSR Warehouse Facility, Due September 2025 [Member] | MSR Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 750,000,000 |
Outstanding | 545,000,000 | 380,000,000
Collateral Pledged | 1,306,000,000 | 1,482,000,000
Notes Payable to Banks | Servicing | $500 MSR WH Facility due June 2025 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 405,000,000 | 365,000,000
Collateral Pledged | 655,000,000 | 732,000,000
Notes Payable to Banks | Servicing | $500 MSR Warehouse Facility due April 2025 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 305,000,000 | 0
Collateral Pledged | 634,000,000 | 0
Notes Payable to Banks | Servicing | $500 MSR Warehouse Facility Due June 2025 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 250,000,000 | 0
Collateral Pledged | 677,000,000 | 0
Notes Payable to Banks | Servicing | $50 MSR Warehouse Facility Due November 2024 [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 50,000,000 |
Outstanding | 29,000,000 | 25,000,000
Collateral Pledged | 67,000,000 | 74,000,000
Notes Payable to Banks | Servicing | $1750 warehouse facility [Member] | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,750,000,000 |
Notes Payable to Banks | Originations | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 822,000,000 | 817,000,000
Collateral Pledged | 915,000,000 | 910,000,000
Notes Payable to Banks | Originations | $1500 Warehouse Facility Due June 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,500,000,000 |
Outstanding | 107,000,000 | 206,000,000
Collateral Pledged | 104,000,000 | 272,000,000
Notes Payable to Banks | Originations | $750 Warehouse Facility Due June 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 750,000,000 |
Outstanding | 137,000,000 | 135,000,000
Collateral Pledged | 176,000,000 | 133,000,000
Notes Payable to Banks | Originations | $750 Warehouse Facility Due October 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 750,000,000 |
Outstanding | 155,000,000 | 202,000,000
Collateral Pledged | 166,000,000 | 209,000,000
Notes Payable to Banks | Originations | $500 Warehouse Facility Due June 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 72,000,000 | 76,000,000
Collateral Pledged | 78,000,000 | 80,000,000
Notes Payable to Banks | Originations | $350 Warehouse Facility Due August 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 350,000,000 |
Outstanding | 73,000,000 | 31,000,000
Collateral Pledged | 75,000,000 | 32,000,000
Notes Payable to Banks | Originations | $300 WH Facility Due February 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 300,000,000 |
Outstanding | 0 | 115,000,000
Collateral Pledged | 0 | 117,000,000
Notes Payable to Banks | Originations | $250 Million Warehouse Facility Due September 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 250,000,000 |
Outstanding | 158,000,000 | 14,000,000
Collateral Pledged | 177,000,000 | 17,000,000
Notes Payable to Banks | Originations | $200 Million Warehouse Facility Due December 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 200,000,000 |
Outstanding | 82,000,000 | 18,000,000
Collateral Pledged | 84,000,000 | 21,000,000
Notes Payable to Banks | Originations | $200 Million Warehouse Facility Due January 2025 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 200,000,000 |
Outstanding | 12,000,000 | 0
Collateral Pledged | 21,000,000 | 0
Notes Payable to Banks | Originations | $100 Million Warehouse Facility Due April 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 100,000,000 |
Outstanding | 25,000,000 | 19,000,000
Collateral Pledged | 33,000,000 | 28,000,000
Notes Payable to Banks | Originations | $100 Million WH Facility Due April 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 100,000,000 |
Outstanding | 0 | 0
Collateral Pledged | 0 | 0
Notes Payable to Banks | Originations | $100 Warehouse Facility due December 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 100,000,000 |
Outstanding | 1,000,000 | 1,000,000
Collateral Pledged | 1,000,000 | 1,000,000
Notes Payable to Banks | Originations | $1 Warehouse Facility Due December 2024 [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,000,000 |
Outstanding | 0 | 0
Collateral Pledged | 0 | $ 0
Notes Payable to Banks | Originations | $1000 Warehouse Facility [Member] | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 1,000,000,000 |

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