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Indebtedness - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Debt Instrument [Line Items] |  |  |  |
Interest Expense | $ 111 | $ 119 | $ 217 | $ 245
Advance Facilities | Servicing |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-Term Debt, Weighted Average Interest Rate, over Time | 3.10% | 3.40% | 2.80% | 3.20%
Warehouse & MSR Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-Term Debt, Weighted Average Interest Rate, over Time | 3.10% | 2.10% | 2.60% | 2.20%
Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Expense | $ 90 | $ 90 | $ 176 | $ 183
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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