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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets |  |
Reverse mortgage interests, net | $ 5,253 | $ 6,279
Financial liabilities |  |
Unsecured senior notes, net | 2,074 | 2,366
Advance and warehouse facilities, net | 6,763 | 4,997
Non-recourse debt | 4,424 | 5,286
Fair Value, Recurring |  |
Financial assets |  |
Cash and cash equivalents | 695 | 329
Restricted cash | 218 | 283
Advances and other receivables, net |  | 988
Loans subject to repurchase from Ginnie Mae | 6,159 | 560
Financial liabilities |  |
Unsecured senior notes, net | 2,074 | 2,366
Advance and warehouse facilities, net | 6,763 | 4,997
Liability for loans subject to repurchase from Ginnie Mae | 6,159 | 560
Fair Value, Recurring | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 695 | 329
Restricted cash | 218 | 283
Advances and other receivables, net |  | 0
Loans subject to repurchase from Ginnie Mae | 0 | 0
Financial liabilities |  |
Unsecured senior notes, net | 2,208 | 2,505
Advance and warehouse facilities, net | 0 | 0
Liability for loans subject to repurchase from Ginnie Mae | 0 | 0
Fair Value, Recurring | Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Advances and other receivables, net |  | 0
Loans subject to repurchase from Ginnie Mae | 6,159 | 560
Financial liabilities |  |
Unsecured senior notes, net | 0 | 0
Advance and warehouse facilities, net | 6,774 | 4,997
Liability for loans subject to repurchase from Ginnie Mae | 6,159 | 560
Fair Value, Recurring | Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Advances and other receivables, net |  | 988
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
Fair Value, Nonrecurring |  |
Financial assets |  |
Advances and other receivables, net | 940 |
Reverse mortgage interests, net | 5,253 | 6,279
Fair Value, Nonrecurring | Participating interest financing |  |
Financial liabilities |  |
Non-recourse debt | 3,485 | 4,299
Fair Value, Nonrecurring | Trust 2020-1 |  |
Financial liabilities |  |
Non-recourse debt | 488 |
Fair Value, Nonrecurring | Trust 2019-2 |  |
Financial liabilities |  |
Non-recourse debt |  | 331
Fair Value, Nonrecurring | Trust 2019-1 |  |
Financial liabilities |  |
Non-recourse debt | 240 | 300
Fair Value, Nonrecurring | Trust 2018-3 |  |
Financial liabilities |  |
Non-recourse debt | 211 | 208
Fair Value, Nonrecurring | Trust 2018-2 |  |
Financial liabilities |  |
Non-recourse debt |  | 148
Fair Value, Nonrecurring | Level 1 |  |
Financial assets |  |
Advances and other receivables, net | 0 |
Reverse mortgage interests, net | 0 | 0
Fair Value, Nonrecurring | Level 1 | Participating interest financing |  |
Financial liabilities |  |
Non-recourse debt | 0 | 0
Fair Value, Nonrecurring | Level 1 | Trust 2020-1 |  |
Financial liabilities |  |
Non-recourse debt |  |
Fair Value, Nonrecurring | Level 1 | Trust 2019-2 |  |
Financial liabilities |  |
Non-recourse debt |  | 0
Fair Value, Nonrecurring | Level 1 | Trust 2019-1 |  |
Financial liabilities |  |
Non-recourse debt | 0 | 0
Fair Value, Nonrecurring | Level 1 | Trust 2018-3 |  |
Financial liabilities |  |
Non-recourse debt | 0 | 0
Fair Value, Nonrecurring | Level 1 | Trust 2018-2 |  |
Financial liabilities |  |
Non-recourse debt |  | 0
Fair Value, Nonrecurring | Level 2 |  |
Financial assets |  |
Advances and other receivables, net | 0 |
Reverse mortgage interests, net | 0 | 0
Fair Value, Nonrecurring | Level 2 | Participating interest financing |  |
Financial liabilities |  |
Non-recourse debt | 0 | 0
Fair Value, Nonrecurring | Level 2 | Trust 2020-1 |  |
Financial liabilities |  |
Non-recourse debt |  |
Fair Value, Nonrecurring | Level 2 | Trust 2019-2 |  |
Financial liabilities |  |
Non-recourse debt |  | 0
Fair Value, Nonrecurring | Level 2 | Trust 2019-1 |  |
Financial liabilities |  |
Non-recourse debt | 0 | 0
Fair Value, Nonrecurring | Level 2 | Trust 2018-3 |  |
Financial liabilities |  |
Non-recourse debt | 0 | 0
Fair Value, Nonrecurring | Level 2 | Trust 2018-2 |  |
Financial liabilities |  |
Non-recourse debt |  | 0
Fair Value, Nonrecurring | Level 3 |  |
Financial assets |  |
Advances and other receivables, net | 940 |
Reverse mortgage interests, net | 5,383 | 6,318
Fair Value, Nonrecurring | Level 3 | Participating interest financing |  |
Financial liabilities |  |
Non-recourse debt | 3,496 | 4,299
Fair Value, Nonrecurring | Level 3 | Trust 2020-1 |  |
Financial liabilities |  |
Non-recourse debt | 490 |
Fair Value, Nonrecurring | Level 3 | Trust 2019-2 |  |
Financial liabilities |  |
Non-recourse debt |  | 331
Fair Value, Nonrecurring | Level 3 | Trust 2019-1 |  |
Financial liabilities |  |
Non-recourse debt | 241 | 300
Fair Value, Nonrecurring | Level 3 | Trust 2018-3 |  |
Financial liabilities |  |
Non-recourse debt | $ 212 | 208
Fair Value, Nonrecurring | Level 3 | Trust 2018-2 |  |
Financial liabilities |  |
Non-recourse debt |  | $ 148

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