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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Financial assets |  |  |
Restricted cash | $ 118 | $ 135 | $ 152
Loans subject to repurchase from Ginnie Mae | 2,703 | 6,159 |
Financial liabilities |  |  |
Unsecured senior notes, net | 2,076 | 2,074 |
Advance and warehouse facilities, net | 8,206 | 6,258 |
Recurring Fair Value Measurements |  |  |
Financial assets |  |  |
Cash and cash equivalents | 731 | 695 |
Restricted cash | 118 | 135 |
Loans subject to repurchase from Ginnie Mae | 2,703 | 6,159 |
Financial liabilities |  |  |
Unsecured senior notes, net | 2,076 | 2,074 |
Advance and warehouse facilities, net | 8,206 | 6,258 |
Liability for loans subject to repurchase from Ginnie Mae | 2,703 | 6,159 |
Recurring Fair Value Measurements | Level 1 |  |  |
Financial assets |  |  |
Cash and cash equivalents | 731 | 695 |
Restricted cash | 118 | 135 |
Loans subject to repurchase from Ginnie Mae | 0 | 0 |
Financial liabilities |  |  |
Unsecured senior notes, net | 2,168 | 2,208 |
Advance and warehouse facilities, net | 0 | 0 |
Liability for loans subject to repurchase from Ginnie Mae | 0 | 0 |
Recurring Fair Value Measurements | Level 2 |  |  |
Financial assets |  |  |
Cash and cash equivalents | 0 | 0 |
Restricted cash | 0 | 0 |
Loans subject to repurchase from Ginnie Mae | 2,703 | 6,159 |
Financial liabilities |  |  |
Unsecured senior notes, net | 0 | 0 |
Advance and warehouse facilities, net | 8,219 | 6,269 |
Liability for loans subject to repurchase from Ginnie Mae | 2,703 | 6,159 |
Recurring Fair Value Measurements | Level 3 |  |  |
Financial assets |  |  |
Cash and cash equivalents | 0 | 0 |
Restricted cash | 0 | 0 |
Loans subject to repurchase from Ginnie Mae | 0 | 0 |
Financial liabilities |  |  |
Unsecured senior notes, net | 0 | 0 |
Advance and warehouse facilities, net | 0 | 0 |
Liability for loans subject to repurchase from Ginnie Mae | 0 | 0 |
Nonrecurring Fair Value Measurements |  |  |
Financial assets |  |  |
Advances and other receivables, net | 909 | 940 |
Nonrecurring Fair Value Measurements | Level 1 |  |  |
Financial assets |  |  |
Advances and other receivables, net | 0 | 0 |
Nonrecurring Fair Value Measurements | Level 2 |  |  |
Financial assets |  |  |
Advances and other receivables, net | 0 | 0 |
Nonrecurring Fair Value Measurements | Level 3 |  |  |
Financial assets |  |  |
Advances and other receivables, net | $ 909 | $ 940 |

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