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Indebtedness - Advance and Warehouse Facilities Summary (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Advance and warehouse facilities, net | $ 8,206,000,000 | $ 6,258,000,000
Document Quarterly Report | true |
Advance Facilities | Servicing | Loans payable | $350 advance facility(3) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 350,000,000 | 875,000,000
Debt outstanding, gross | 136,000,000 | 168,000,000
Collateral Pledged | $ 159,000,000 | 195,000,000
Advance Facilities | Servicing | Loans payable | $350 advance facility(3) | CP rate | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 2.00% |
Advance Facilities | Servicing | Loans payable | $350 advance facility(3) | CP rate | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 6.50% |
Advance Facilities | Servicing | Loans payable | $640 advance facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 350,000,000 | 425,000,000
Debt outstanding, gross | 168,000,000 | 192,000,000
Collateral Pledged | $ 211,000,000 | 246,000,000
Advance Facilities | Servicing | Loans payable | $640 advance facility | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.10% |
Advance Facilities | Servicing | Loans payable | $640 advance facility | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 6.50% |
Advance Facilities | Servicing | Notes payable to banks |  |
Debt Instrument [Line Items] |  |
Debt outstanding, gross | $ 539,000,000 | 669,000,000
Collateral Pledged | 684,000,000 | 844,000,000
Advance Facilities | Servicing | Notes payable to banks | $100 advance facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 100,000,000 |
Debt outstanding, gross | 65,000,000 | 74,000,000
Collateral Pledged | $ 86,000,000 | 98,000,000
Advance Facilities | Servicing | Notes payable to banks | $100 advance facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 2.50% |
Warehouse Facilities | Originations | Notes payable to banks |  |
Debt Instrument [Line Items] |  |
Debt outstanding, gross | $ 7,375,000,000 | 5,330,000,000
Collateral Pledged | 7,735,000,000 | 5,447,000,000
Warehouse Facilities | Originations | Notes payable to banks | $4,000 warehouse facility(4) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 4,000,000,000 | 2,000,000,000
Debt outstanding, gross | 3,117,000,000 | 339,000,000
Collateral Pledged | $ 3,352,000,000 | 392,000,000
Warehouse Facilities | Originations | Notes payable to banks | $4,000 warehouse facility(4) | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.60% |
Warehouse Facilities | Originations | Notes payable to banks | $4,000 warehouse facility(4) | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 2.20% |
Warehouse Facilities | Originations | Notes payable to banks | $1,500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 1,500,000,000 |
Debt outstanding, gross | 546,000,000 | 1,081,000,000
Collateral Pledged | $ 529,000,000 | 1,028,000,000
Warehouse Facilities | Originations | Notes payable to banks | $1,500 warehouse facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.50% |
Warehouse Facilities | Originations | Notes payable to banks | $2,500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 2,500,000,000 | 1,500,000,000
Debt outstanding, gross | 1,225,000,000 | 1,003,000,000
Collateral Pledged | $ 1,276,000,000 | 1,037,000,000
Warehouse Facilities | Originations | Notes payable to banks | $2,500 warehouse facility | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.60% |
Warehouse Facilities | Originations | Notes payable to banks | $2,500 warehouse facility | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.90% |
Warehouse Facilities | Originations | Notes payable to banks | $1,350 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 1,600,000,000 |
Debt outstanding, gross | 906,000,000 | 951,000,000
Collateral Pledged | $ 945,000,000 | 977,000,000
Warehouse Facilities | Originations | Notes payable to banks | $1,350 warehouse facility | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.50% |
Warehouse Facilities | Originations | Notes payable to banks | $1,350 warehouse facility | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.00% |
Warehouse Facilities | Originations | Notes payable to banks | $1,200 warehouse facility(6) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 1,200,000,000 |
Debt outstanding, gross | 473,000,000 | 586,000,000
Collateral Pledged | $ 492,000,000 | 607,000,000
Warehouse Facilities | Originations | Notes payable to banks | $1,200 warehouse facility(6) | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.80% |
Warehouse Facilities | Originations | Notes payable to banks | $1,200 warehouse facility(6) | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.00% |
Warehouse Facilities | Originations | Notes payable to banks | $750 million warehouse |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 500,000,000 | 750,000,000
Debt outstanding, gross | 231,000,000 | 562,000,000
Collateral Pledged | $ 238,000,000 | 574,000,000
Warehouse Facilities | Originations | Notes payable to banks | $750 million warehouse | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.50% |
Warehouse Facilities | Originations | Notes payable to banks | $750 million warehouse | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.80% |
Warehouse Facilities | Originations | Notes payable to banks | $750 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 550,000,000 | 750,000,000
Debt outstanding, gross | 84,000,000 | 477,000,000
Collateral Pledged | $ 86,000,000 | 492,000,000
Warehouse Facilities | Originations | Notes payable to banks | $750 warehouse facility | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.50% |
Warehouse Facilities | Originations | Notes payable to banks | $600 warehouse facility(6) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 600,000,000 |
Debt outstanding, gross | 37,000,000 | 0
Collateral Pledged | $ 38,000,000 | 0
Warehouse Facilities | Originations | Notes payable to banks | $600 warehouse facility(6) | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 2.50% |
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility(6) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 500,000,000 |
Debt outstanding, gross | 125,000,000 | 0
Collateral Pledged | $ 125,000,000 | 0
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility(6) | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.50% |
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility(6) | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 4.00% |
Warehouse Facilities | Originations | Notes payable to banks | $300 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 300,000,000 |
Debt outstanding, gross | 94,000,000 | 163,000,000
Collateral Pledged | $ 96,000,000 | 164,000,000
Warehouse Facilities | Originations | Notes payable to banks | $300 warehouse facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.40% |
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility(10) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 200,000,000 |
Debt outstanding, gross | 3,000,000 | 131,000,000
Collateral Pledged | $ 3,000,000 | 134,000,000
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility(10) | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.80% |
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility(11) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 200,000,000 | 50,000,000
Debt outstanding, gross | 47,000,000 | 37,000,000
Collateral Pledged | $ 54,000,000 | 42,000,000
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility(11) | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.60% |
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility(11) | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 4.90% |
Warehouse Facilities | Originations | Notes payable to banks | $30 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 30,000,000 | 40,000,000
Debt outstanding, gross | 0 | 0
Collateral Pledged | $ 0 | 0
Warehouse Facilities | Originations | Notes payable to banks | $30 warehouse facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.30% |
Warehouse Facilities | Originations | Notes payable to banks | $1,500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 2,000,000,000 | 1,500,000,000
Warehouse Facilities | Originations | Notes payable to banks | $500 Million Warehouse Facility Due June 2023 |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Debt outstanding, gross | 439,000,000 | 0
Collateral Pledged | $ 452,000,000 | 0
Warehouse Facilities | Originations | Notes payable to banks | $500 Million Warehouse Facility Due June 2023 | LIBOR | Min |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.50% |
Warehouse Facilities | Originations | Notes payable to banks | $500 Million Warehouse Facility Due June 2023 | LIBOR | Max |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.00% |
Warehouse Facilities | Originations | Notes payable to banks | $500 Million Warehouse Facility Due August 2023 |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 500,000,000 |
Debt outstanding, gross | 48,000,000 | 0
Collateral Pledged | $ 49,000,000 | 0
Warehouse Facilities | Originations | Notes payable to banks | $500 Million Warehouse Facility Due August 2023 | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 1.70% |
MSR Facilities | Servicing | Notes payable to banks |  |
Debt Instrument [Line Items] |  |
Debt outstanding, gross | $ 305,000,000 | 270,000,000
Collateral Pledged | 2,295,000,000 | 1,217,000,000
MSR Facilities | Servicing | Notes payable to banks | $200 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 400,000,000 | 200,000,000
Debt outstanding, gross | 35,000,000 | 0
Collateral Pledged | $ 685,000,000 | 247,000,000
MSR Facilities | Servicing | Notes payable to banks | $200 warehouse facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.00% |
MSR Facilities | Servicing | Notes payable to banks | $150 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 400,000,000 | 150,000,000
Debt outstanding, gross | 0 | 0
Collateral Pledged | $ 601,000,000 | 228,000,000
MSR Facilities | Servicing | Notes payable to banks | $150 warehouse facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.00% |
MSR Facilities | Servicing | Notes payable to banks | $50 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 50,000,000 |
Debt outstanding, gross | 10,000,000 | 10,000,000
Collateral Pledged | $ 69,000,000 | 74,000,000
MSR Facilities | Servicing | Notes payable to banks | $50 warehouse facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.30% |
MSR Facilities | Originations | Notes payable to banks | $900 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 1,200,000,000 | 900,000,000
Advance Financing, Internally Allocated | Servicing | Loans payable | $425 advance facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 940,000,000 | 640,000,000
Debt outstanding, gross | 170,000,000 | 235,000,000
Collateral Pledged | $ 228,000,000 | 305,000,000
Advance Financing, Internally Allocated | Servicing | Loans payable | $425 advance facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.50% |
MSR Financing, Internally Allocated | Servicing | Notes payable to banks | $260 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 260,000,000 |
Debt outstanding, gross | 260,000,000 | 260,000,000
Collateral Pledged | $ 940,000,000 | 668,000,000
MSR Financing, Internally Allocated | Servicing | Notes payable to banks | $260 warehouse facility | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on rate | 3.50% |
MSR Financing, Internally Allocated | Originations | Notes payable to banks | $260 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | $ 260,000,000 | 260,000,000
Advance, Warehouse and MSR Facilities |  |
Debt Instrument [Line Items] |  |
Debt outstanding, gross | 8,219,000,000 | 6,269,000,000
Collateral Pledged | 10,714,000,000 | 7,508,000,000
Unamortized debt issuance costs | (13,000,000) | (11,000,000)
Advance and warehouse facilities, net | $ 8,206,000,000 | $ 6,258,000,000

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