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Indebtedness - Advance and Warehouse Facilities Summary (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Total advance and warehouse facilities, net(15) | $ 4,997,000,000 | $ 6,258,000,000
Advance, Warehouse and MSR Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 5,009,000,000 | 6,774,000,000
Collateral Pledged | 7,935,000,000 | 8,114,000,000
Unamortized debt issuance costs | (12,000,000) | (11,000,000)
Total advance and warehouse facilities, net(15) | 4,997,000,000 | 6,763,000,000
Loans Payable | Servicing | $940 Advance Facility Due August 2023 | Advance Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 940,000,000 | 640,000,000
Outstanding | 234,000,000 | 235,000,000
Collateral Pledged | 318,000,000 | 305,000,000
Loans Payable | Servicing | $940 Advance Facility Due August 2023 | Advance Facilities, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 940,000,000 |
Loans Payable | Servicing | $350 Advance Facility Due October 2022 | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 350,000,000 | 425,000,000
Outstanding | 160,000,000 | 192,000,000
Collateral Pledged | 197,000,000 | 246,000,000
Loans Payable | Servicing | $350 Advance Facility Due January 2022 | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 350,000,000 | 875,000,000
Loans Payable | Servicing | $640 advance facility | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 350,000,000 |
Outstanding | 162,000,000 | 168,000,000
Collateral Pledged | 190,000,000 | 195,000,000
Loans Payable | Servicing | $75 Advance facility | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 75,000,000 | 100,000,000
Loans Payable | LIBOR | Servicing | $940 Advance Facility Due August 2023 | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.50% |
Loans Payable | Minimum | LIBOR | Servicing | $350 Advance Facility Due October 2022 | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.10% |
Loans Payable | Minimum | CPRATE | Servicing | $640 advance facility | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Loans Payable | Maximum | LIBOR | Servicing | $350 Advance Facility Due October 2022 | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.50% |
Loans Payable | Maximum | CPRATE | Servicing | $640 advance facility | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.50% |
Notes Payable to Banks | Servicing | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | $ 614,000,000 | 669,000,000
Collateral Pledged | 794,000,000 | 844,000,000
Notes Payable to Banks | Servicing | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 270,000,000 | 270,000,000
Collateral Pledged | 2,814,000,000 | 1,217,000,000
Notes Payable to Banks | Servicing | $260 warehouse facility | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 260,000,000 |
Outstanding | 260,000,000 | 260,000,000
Collateral Pledged | 1,107,000,000 | 668,000,000
Notes Payable to Banks | Servicing | $260 warehouse facility | MSR Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 260,000,000 | 260,000,000
Notes Payable to Banks | Servicing | $150 warehouse facility | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 50,000,000 |
Outstanding | 10,000,000 | 10,000,000
Collateral Pledged | 124,000,000 | 74,000,000
Notes Payable to Banks | Servicing | $1200 warehouse facility | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,200,000,000 | 900,000,000
Notes Payable to Banks | Servicing | $400 Warehouse Facility Due August 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 400,000,000 | 200,000,000
Notes Payable to Banks | Servicing | $400 Warehouse Facility Due August 2022 | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 400,000,000 |
Outstanding | 0 | 0
Collateral Pledged | 838,000,000 | 247,000,000
Notes Payable to Banks | Servicing | $75 Advance facility | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 75,000,000 |
Outstanding | 58,000,000 | 74,000,000
Collateral Pledged | 89,000,000 | 98,000,000
Notes Payable to Banks | Servicing | $400 Warehouse Facility, Due September 2023 | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount |  | 150,000,000
Notes Payable to Banks | Servicing | $400 Warehouse Facility, Due September 2023 | MSR Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 400,000,000 |
Outstanding | 0 | 0
Collateral Pledged | 745,000,000 | 228,000,000
Notes Payable to Banks | Originations | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Outstanding | 4,125,000,000 | 5,835,000,000
Collateral Pledged | 4,327,000,000 | 6,053,000,000
Notes Payable to Banks | Originations | $750 warehouse facility due October 2021 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 750,000,000 | 1,200,000,000
Outstanding | 256,000,000 | 787,000,000
Collateral Pledged | 270,000,000 | 839,000,000
Notes Payable to Banks | Originations | $4000 Warehouse Facility Due February 2023 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 4,000,000,000 | 2,000,000,000
Outstanding | 1,224,000,000 | 339,000,000
Collateral Pledged | 1,341,000,000 | 392,000,000
Notes Payable to Banks | Originations | $2500 Warehouse Facility Due October 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 2,500,000,000 | 1,500,000,000
Outstanding | 991,000,000 | 1,003,000,000
Collateral Pledged | 1,024,000,000 | 1,037,000,000
Notes Payable to Banks | Originations | $1600 Warehouse Facility Due September 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,600,000,000 |
Outstanding | 409,000,000 | 1,067,000,000
Collateral Pledged | 425,000,000 | 1,128,000,000
Notes Payable to Banks | Originations | $1500 Warehouse Facility Due June 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,500,000,000 |
Outstanding | 356,000,000 | 1,081,000,000
Collateral Pledged | 345,000,000 | 1,028,000,000
Notes Payable to Banks | Originations | $600 Warehouse Facility Due February 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 600,000,000 |
Outstanding | 5,000,000 | 187,000,000
Collateral Pledged | 6,000,000 | 222,000,000
Notes Payable to Banks | Originations | $550 Million Warehouse Facility Due August 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 550,000,000 | 750,000,000
Outstanding | 87,000,000 | 477,000,000
Collateral Pledged | 89,000,000 | 492,000,000
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due June 2023 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 188,000,000 | 0
Collateral Pledged | 194,000,000 | 0
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due September 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 | 750,000,000
Outstanding | 419,000,000 | 562,000,000
Collateral Pledged | 430,000,000 | 574,000,000
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due June 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 39,000,000 | 0
Collateral Pledged | 39,000,000 | 0
Notes Payable to Banks | Originations | $500 Million Warehouse Facility Due August 2023 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Outstanding | 38,000,000 | 0
Collateral Pledged | 39,000,000 | 0
Notes Payable to Banks | Originations | $200 Million Warehouse Facility Due October 2021 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 200,000,000 |
Outstanding | 0 | 131,000,000
Collateral Pledged | 0 | 134,000,000
Notes Payable to Banks | Originations | $200 Warehouse Facility Due April 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 200,000,000 | 50,000,000
Outstanding | 46,000,000 | 37,000,000
Collateral Pledged | 58,000,000 | 42,000,000
Notes Payable to Banks | Originations | $30 Million Warehouse Facility, Due January 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 30,000,000 |
Outstanding | 0 | 1,000,000
Collateral Pledged | 0 | 1,000,000
Notes Payable to Banks | Originations | $2000 Warehouse Facility | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 2,000,000,000 | 1,500,000,000
Notes Payable to Banks | Originations | $505 Warehouse Facility related to Discontinued Ops | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 505,000,000 |
Notes Payable to Banks | Originations | $300 warehouse facility | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 325,000,000 |
Outstanding | 67,000,000 | 163,000,000
Collateral Pledged | $ 67,000,000 | $ 164,000,000
Notes Payable to Banks | LIBOR | Servicing | $260 warehouse facility | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.50% |
Notes Payable to Banks | LIBOR | Servicing | $150 warehouse facility | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.80% |
Notes Payable to Banks | LIBOR | Servicing | $400 Warehouse Facility Due August 2022 | MSR Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.00% |
Notes Payable to Banks | LIBOR | Servicing | $75 Advance facility | Advance Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.00% |
Notes Payable to Banks | LIBOR | Servicing | $400 Warehouse Facility, Due September 2023 | MSR Financing, Internally Allocated |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.00% |
Notes Payable to Banks | LIBOR | Originations | $1500 Warehouse Facility Due June 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Notes Payable to Banks | LIBOR | Originations | $600 Warehouse Facility Due February 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.50% |
Notes Payable to Banks | LIBOR | Originations | $550 Million Warehouse Facility Due August 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Notes Payable to Banks | LIBOR | Originations | $500 Million Warehouse Facility Due August 2023 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.70% |
Notes Payable to Banks | LIBOR | Originations | $200 Million Warehouse Facility Due October 2021 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.80% |
Notes Payable to Banks | LIBOR | Originations | $30 Million Warehouse Facility, Due January 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.30% |
Notes Payable to Banks | LIBOR | Originations | $300 warehouse facility | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Notes Payable to Banks | Minimum | LIBOR | Originations | $750 warehouse facility due October 2021 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Notes Payable to Banks | Minimum | LIBOR | Originations | $4000 Warehouse Facility Due February 2023 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.60% |
Notes Payable to Banks | Minimum | LIBOR | Originations | $2500 Warehouse Facility Due October 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Notes Payable to Banks | Minimum | LIBOR | Originations | $1600 Warehouse Facility Due September 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Notes Payable to Banks | Minimum | LIBOR | Originations | $500 Million Warehouse Facility Due June 2023 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.60% |
Notes Payable to Banks | Minimum | LIBOR | Originations | $500 Million Warehouse Facility Due September 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Notes Payable to Banks | Minimum | LIBOR | Originations | $500 Million Warehouse Facility Due June 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.50% |
Notes Payable to Banks | Minimum | LIBOR | Originations | $200 Warehouse Facility Due April 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.60% |
Notes Payable to Banks | Maximum | LIBOR | Originations | $750 warehouse facility due October 2021 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.00% |
Notes Payable to Banks | Maximum | LIBOR | Originations | $4000 Warehouse Facility Due February 2023 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.20% |
Notes Payable to Banks | Maximum | LIBOR | Originations | $2500 Warehouse Facility Due October 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.90% |
Notes Payable to Banks | Maximum | LIBOR | Originations | $1600 Warehouse Facility Due September 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.00% |
Notes Payable to Banks | Maximum | LIBOR | Originations | $500 Million Warehouse Facility Due June 2023 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.00% |
Notes Payable to Banks | Maximum | LIBOR | Originations | $500 Million Warehouse Facility Due September 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.80% |
Notes Payable to Banks | Maximum | LIBOR | Originations | $500 Million Warehouse Facility Due June 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.00% |
Notes Payable to Banks | Maximum | LIBOR | Originations | $200 Warehouse Facility Due April 2022 | Warehouse Facilities |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.90% |

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