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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets |  |
Reverse mortgage interests, net | $ 5,091 | $ 5,253
Loans subject to repurchase from Ginnie Mae | 5,816 | 6,159
Financial liabilities |  |
Unsecured senior notes, net | 2,074 | 2,074
Advance and warehouse facilities, net | 7,379 | 6,763
Other nonrecourse debt | 4,221 | 4,424
Recurring Fair Value Measurements |  |
Financial assets |  |
Cash and cash equivalents | 674 | 695
Restricted cash | 261 | 218
Loans subject to repurchase from Ginnie Mae | 5,816 | 6,159
Financial liabilities |  |
Unsecured senior notes, net | 2,074 | 2,074
Advance and warehouse facilities, net | 7,379 | 6,763
Liability for loans subject to repurchase from Ginnie Mae | 5,816 | 6,159
Recurring Fair Value Measurements | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 674 | 695
Restricted cash | 261 | 218
Loans subject to repurchase from Ginnie Mae | 0 | 0
Financial liabilities |  |
Unsecured senior notes, net | 2,120 | 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 | 5,816 | 6,159
Financial liabilities |  |
Unsecured senior notes, net | 0 | 0
Advance and warehouse facilities, net | 7,388 | 6,774
Liability for loans subject to repurchase from Ginnie Mae | 5,816 | 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 | 838 | 940
Reverse mortgage interests, net | 5,091 | 5,253
Nonrecurring Fair Value Measurements | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt | 3,318 | 3,485
Nonrecurring Fair Value Measurements | Trust 2020-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 469 | 488
Nonrecurring Fair Value Measurements | Trust 2019-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 231 | 240
Nonrecurring Fair Value Measurements | Trust 2019-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 203 | 211
Nonrecurring Fair Value Measurements | Level 1 |  |
Financial assets |  |
Advances and other receivables, net | 0 | 0
Reverse mortgage interests, net | 0 | 0
Nonrecurring Fair Value Measurements | Level 1 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring Fair Value Measurements | Level 1 | Trust 2020-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring Fair Value Measurements | Level 1 | Trust 2019-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring Fair Value Measurements | Level 1 | Trust 2019-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring Fair Value Measurements | Level 2 |  |
Financial assets |  |
Advances and other receivables, net | 0 | 0
Reverse mortgage interests, net | 0 | 0
Nonrecurring Fair Value Measurements | Level 2 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring Fair Value Measurements | Level 2 | Trust 2020-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring Fair Value Measurements | Level 2 | Trust 2019-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring Fair Value Measurements | Level 2 | Trust 2019-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring Fair Value Measurements | Level 3 |  |
Financial assets |  |
Advances and other receivables, net | 838 | 940
Reverse mortgage interests, net | 5,166 | 5,383
Nonrecurring Fair Value Measurements | Level 3 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt | 3,319 | 3,496
Nonrecurring Fair Value Measurements | Level 3 | Trust 2020-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 471 | 490
Nonrecurring Fair Value Measurements | Level 3 | Trust 2019-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 231 | 241
Nonrecurring Fair Value Measurements | Level 3 | Trust 2019-1 |  |
Financial liabilities |  |
Other nonrecourse debt | $ 203 | $ 212

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