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Indebtedness - Advance and Warehouse Facilities Summary (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Advance and warehouse facilities, net | $ 3,407,000,000 | $ 4,997,000,000
Advance Facilities | Servicing | Loans payable | $350 advance facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 350,000,000 |
Debt outstanding, gross | 156,000,000 | 160,000,000
Collateral Pledged | 186,000,000 | 197,000,000
Advance Facilities | Servicing | Loans payable | $350 advance facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 350,000,000 |
Debt outstanding, gross | 145,000,000 | 162,000,000
Collateral Pledged | 172,000,000 | 190,000,000
Advance Facilities | Servicing | Notes payable to banks |  |
Debt Instrument [Line Items] |  |
Debt outstanding, gross | 523,000,000 | 614,000,000
Collateral Pledged | 671,000,000 | 794,000,000
Advance Facilities | Servicing | Notes payable to banks | $75 advance facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 75,000,000 |
Debt outstanding, gross | 49,000,000 | 58,000,000
Collateral Pledged | 70,000,000 | 89,000,000
Warehouse Facilities | Originations | Notes payable to banks |  |
Debt Instrument [Line Items] |  |
Debt outstanding, gross | 1,939,000,000 | 4,125,000,000
Collateral Pledged | 2,111,000,000 | 4,327,000,000
Warehouse Facilities | Originations | Notes payable to banks | $4,000 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 4,000,000,000 |
Debt outstanding, gross | 661,000,000 | 1,224,000,000
Collateral Pledged | 771,000,000 | 1,341,000,000
Warehouse Facilities | Originations | Notes payable to banks | $2,500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 2,500,000,000 |
Debt outstanding, gross | 532,000,000 | 991,000,000
Collateral Pledged | 550,000,000 | 1,024,000,000
Warehouse Facilities | Originations | Notes payable to banks | $1,500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,500,000,000 |
Debt outstanding, gross | 180,000,000 | 356,000,000
Collateral Pledged | 180,000,000 | 345,000,000
Warehouse Facilities | Originations | Notes payable to banks | $750 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 750,000,000 |
Debt outstanding, gross | 241,000,000 | 256,000,000
Collateral Pledged | 253,000,000 | 270,000,000
Warehouse Facilities | Originations | Notes payable to banks | $450 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 450,000,000 |
Debt outstanding, gross | 0 | 87,000,000
Collateral Pledged | 0 | 89,000,000
Warehouse Facilities | Originations | Notes payable to banks | $600 warehouse facility(2) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 600,000,000 |
Debt outstanding, gross | 91,000,000 | 409,000,000
Collateral Pledged | 101,000,000 | 425,000,000
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Debt outstanding, gross | 9,000,000 | 188,000,000
Collateral Pledged | 10,000,000 | 194,000,000
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Debt outstanding, gross | 117,000,000 | 419,000,000
Collateral Pledged | 120,000,000 | 430,000,000
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Debt outstanding, gross | 57,000,000 | 39,000,000
Collateral Pledged | 68,000,000 | 39,000,000
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 500,000,000 |
Debt outstanding, gross | 31,000,000 | 38,000,000
Collateral Pledged | 32,000,000 | 39,000,000
Warehouse Facilities | Originations | Notes payable to banks | $325 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 325,000,000 |
Debt outstanding, gross | 1,000,000 | 67,000,000
Collateral Pledged | 1,000,000 | 67,000,000
Warehouse Facilities | Originations | Notes payable to banks | $250 warehouse facility(3) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 250,000,000 | 600
Debt outstanding, gross | 0 | 5,000,000
Collateral Pledged | 0 | 6,000,000
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 200,000,000 |
Debt outstanding, gross | 19,000,000 | 46,000,000
Collateral Pledged | 25,000,000 | 58,000,000
Warehouse Facilities | Originations | Notes payable to banks | $30 warehouse facility(4) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 0 |
Debt outstanding, gross | 0 | 0
Collateral Pledged | 0 | 0
Warehouse Facilities | Originations | Notes payable to banks | $1,000 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,000,000,000 |
MSR Facilities | Servicing | Notes payable to banks |  |
Debt Instrument [Line Items] |  |
Debt outstanding, gross | 950,000,000 | 270,000,000
Collateral Pledged | 5,054,000,000 | 2,814,000,000
MSR Facilities | Servicing | Notes payable to banks | $800 warehouse facility(1)(5) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 800,000,000 | 260,000,000
Debt outstanding, gross | 260,000,000 | 260,000,000
Collateral Pledged | 2,008,000,000 | 1,107,000,000
MSR Facilities | Servicing | Notes payable to banks | $600 warehouse facility(6) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 600,000,000 | 400,000,000
Debt outstanding, gross | 400,000,000 | 0
Collateral Pledged | 883,000,000 | 838,000,000
MSR Facilities | Servicing | Notes payable to banks | $400 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 400,000,000 |
Debt outstanding, gross | 200,000,000 | 0
Collateral Pledged | 710,000,000 | 0
MSR Facilities | Servicing | Notes payable to banks | $400 warehouse facility(2) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 400,000,000 |
Debt outstanding, gross | 65,000,000 | 0
Collateral Pledged | 1,376,000,000 | 745,000,000
MSR Facilities | Servicing | Notes payable to banks | $50 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 50,000,000 |
Debt outstanding, gross | 25,000,000 | 10,000,000
Collateral Pledged | 77,000,000 | 124,000,000
MSR Facilities | Servicing | Notes payable to banks | $1,200 warehouse facility |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 1,200,000,000 | 1,200,000,000
Advance Financing, Internally Allocated | Servicing | Loans payable | $400 advance facility(1) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 400,000,000 | 940,000,000
Debt outstanding, gross | 173,000,000 | 234,000,000
Collateral Pledged | 243,000,000 | 318,000,000
MSR Financing, Internally Allocated | Servicing | Notes payable to banks | $800 warehouse facility(1)(5) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 800,000,000 | 260,000,000
MSR Financing, Internally Allocated | Servicing | Notes payable to banks | $400 warehouse facility(2) |  |
Debt Instrument [Line Items] |  |
Capacity Amount | 400,000,000 |
Advance, Warehouse and MSR Facilities |  |
Debt Instrument [Line Items] |  |
Debt outstanding, gross | 3,412,000,000 | 5,009,000,000
Collateral Pledged | 7,836,000,000 | 7,935,000,000
Unamortized debt issuance costs | (5,000,000) | (12,000,000)
Advance and warehouse facilities, net | $ 3,407,000,000 | $ 4,997,000,000

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