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Indebtedness - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Debt Instrument [Line Items] |  |
Interest Expense | $ 106 | $ 126
Advance Facilities | Servicing |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 2.40% | 3.00%
Warehouse & MSR Facilities |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 2.10% | 2.20%
Debt |  |
Debt Instrument [Line Items] |  |
Interest Expense | $ 86 | $ 93
Unsecured Senior Notes |  |
Debt Instrument [Line Items] |  |
Maximum percentage redeemable on unsecured debt | 40.00% |
Repayments of debt | $ 0 | 0
Amount of principal amount outstanding repaid | $ 0 | $ 0

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