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Indebtedness - Advance and Warehouse Facilities Summary (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2023
Debt Instrument [Line Items] |  |  |
Total advance and warehouse facilities, net | $ 2,885,000,000 | $ 4,997,000,000 |
Advance, Warehouse and MSR Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding | 2,896,000,000 | 5,009,000,000 |
Collateral Pledged | 7,262,000,000 | 7,935,000,000 |
Unamortized debt issuance costs | (11,000,000) | (12,000,000) |
Total advance and warehouse facilities, net | $ 2,885,000,000 | $ 4,997,000,000 |
Warehouse & MSR Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Short-Term Debt, Weighted Average Interest Rate, over Time | 4.00% | 2.00% |
Servicing | Advance Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Short-Term Debt, Weighted Average Interest Rate, over Time | 4.10% | 2.80% |
Loans Payable | Servicing | $640 advance facility | Advance Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | $ 350,000,000 |  |
Outstanding | 171,000,000 | $ 160,000,000 |
Collateral Pledged | 209,000,000 | 197,000,000 |
Loans Payable | Servicing | $640 advance facility | Advance Facilities | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount |  |  | $ 250,000,000
Loans Payable | Servicing | $350 Advance Facility Due October 2024 | Advance Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 350,000,000 |  |
Outstanding | 150,000,000 | 234,000,000 |
Collateral Pledged | 189,000,000 | 318,000,000 |
Loans Payable | Servicing | $300 Advance Facility Due November 2024 | Advance Financing, Internally Allocated |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 350,000,000 |  |
Outstanding | 308,000,000 | 162,000,000 |
Collateral Pledged | 410,000,000 | 190,000,000 |
Notes Payable to Banks | Servicing | Advance Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding | 669,000,000 | 614,000,000 |
Collateral Pledged | 853,000,000 | 794,000,000 |
Notes Payable to Banks | Servicing | MSR Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding | 1,410,000,000 | 270,000,000 |
Collateral Pledged | 5,499,000,000 | 2,814,000,000 |
Notes Payable to Banks | Servicing | $260 warehouse facility | MSR Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 500,000,000 |  |
Outstanding | 380,000,000 | 0 |
Collateral Pledged | 1,482,000,000 | 745,000,000 |
Notes Payable to Banks | Servicing | $260 warehouse facility | MSR Financing, Internally Allocated |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 500,000,000 |  |
Notes Payable to Banks | Servicing | $150 warehouse facility | MSR Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 50,000,000 |  |
Outstanding | 25,000,000 | 10,000,000 |
Collateral Pledged | 74,000,000 | 124,000,000 |
Notes Payable to Banks | Servicing | $1200 warehouse facility | MSR Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 1,400,000,000 |  |
Notes Payable to Banks | Servicing | $400 Warehouse Facility Due August 2022 | MSR Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 1,050,000,000 |  |
Outstanding | 260,000,000 | 260,000,000 |
Collateral Pledged | 2,284,000,000 | 1,107,000,000 |
Notes Payable to Banks | Servicing | $400 Warehouse Facility Due August 2022 | MSR Financing, Internally Allocated |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 1,050,000,000 |  |
Notes Payable to Banks | Servicing | $400 Warehouse Facility, Due September 2023 | MSR Financing, Internally Allocated |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 600,000,000 |  |
Outstanding | 380,000,000 | 0 |
Collateral Pledged | 927,000,000 | 838,000,000 |
Notes Payable to Banks | Servicing | $75 Advance facility due December 2022 | Advance Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 75,000,000 |  |
Outstanding | 40,000,000 | 58,000,000 |
Collateral Pledged | 45,000,000 | 89,000,000 |
Notes Payable to Banks | Servicing | $400 Warehouse Facility Due June 2024 | MSR Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 500,000,000 |  |
Outstanding | 365,000,000 | 0 |
Collateral Pledged | 732,000,000 | 0 |
Notes Payable to Banks | Originations | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding | 817,000,000 | 4,125,000,000 |
Collateral Pledged | 910,000,000 | 4,327,000,000 |
Notes Payable to Banks | Originations | $750 warehouse facility due October 2021 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 0 |  |
Outstanding | 0 | 256,000,000 |
Collateral Pledged | 0 | 270,000,000 |
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due June 2023 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 200,000,000 |  |
Outstanding | 18,000,000 | 188,000,000 |
Collateral Pledged | 21,000,000 | 194,000,000 |
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due September 2022 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 450,000,000 |  |
Outstanding | 0 | 87,000,000 |
Collateral Pledged | 0 | 89,000,000 |
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due June 2022 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 300,000,000 |  |
Outstanding | 115,000,000 | 419,000,000 |
Collateral Pledged | 117,000,000 | 430,000,000 |
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due August 2023 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 250,000,000 |  |
Outstanding | 0 | 5,000,000 |
Collateral Pledged | 0 | 6,000,000 |
Notes Payable to Banks | Originations | $200 Warehouse Facility Due April 2022 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 125,000,000 |  |
Outstanding | 1,000,000 | 67,000,000 |
Collateral Pledged | 1,000,000 | 67,000,000 |
Notes Payable to Banks | Originations | $30 Million Warehouse Facility, Due January 2022 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 0 |  |
Outstanding | 0 | 0 |
Collateral Pledged | 0 | 0 |
Notes Payable to Banks | Originations | $2000 Warehouse Facility | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 1,000,000,000 |  |
Notes Payable to Banks | Originations | $300 warehouse facility | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 200,000,000 |  |
Outstanding | 19,000,000 | 46,000,000 |
Collateral Pledged | 28,000,000 | 58,000,000 |
Notes Payable to Banks | Originations | $1500 Warehouse Facility Due February 2023 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 1,500,000,000 |  |
Outstanding | 206,000,000 | 1,224,000,000 |
Collateral Pledged | 272,000,000 | 1,341,000,000 |
Notes Payable to Banks | Originations | $1500 Warehouse Facility Due June 2023 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 1,500,000,000 |  |
Outstanding | 135,000,000 | 356,000,000 |
Collateral Pledged | 133,000,000 | 345,000,000 |
Notes Payable to Banks | Originations | $1000 Warehouse Facility Due October 2023 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 750,000,000 |  |
Outstanding | 202,000,000 | 991,000,000 |
Collateral Pledged | 209,000,000 | 1,024,000,000 |
Notes Payable to Banks | Originations | $500 Warehouse Facility Due September 2024 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 500,000,000 |  |
Outstanding | 14,000,000 | 409,000,000 |
Collateral Pledged | 17,000,000 | 425,000,000 |
Notes Payable to Banks | Originations | $500 Million WH Facility Due June 2023 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 500,000,000 |  |
Outstanding | 76,000,000 | 39,000,000 |
Collateral Pledged | 80,000,000 | 39,000,000 |
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due August 2023 | Warehouse Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Capacity Amount | 500,000,000 |  |
Outstanding | 31,000,000 | 38,000,000 |
Collateral Pledged | $ 32,000,000 | $ 39,000,000 |

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