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Loans Subject to Repurchase from Ginnie Mae (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Recurring |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans subject to repurchase from Ginnie Mae | $ 6,159 | $ 560
Financial Asset, Equal to or Greater than 90 Days Past Due | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans subject to repurchase from Ginnie Mae | $ 5,879 |

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