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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets |  |
Reverse mortgage interests, net | $ 5,460 | $ 6,279
Financial liabilities |  |
Unsecured senior notes | 2,167 | 2,366
Advance facilities | 4,851 | 4,997
Other nonrecourse debt | 4,671 | 5,286
Recurring Fair Value Measurements |  |
Financial assets |  |
Cash and cash equivalents | 946 | 329
Restricted cash | 229 | 283
Advances and other receivables, net | 745 | 988
Financial liabilities |  |
Advance facilities | 4,851 | 4,997
Recurring Fair Value Measurements | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 946 | 329
Restricted cash | 229 | 283
Advances and other receivables, net | 0 | 0
Financial liabilities |  |
Advance facilities | 0 | 0
Recurring Fair Value Measurements | Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Advances and other receivables, net | 0 | 0
Financial liabilities |  |
Advance facilities | 4,851 | 4,997
Recurring Fair Value Measurements | Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Advances and other receivables, net | 745 | 988
Financial liabilities |  |
Advance facilities | 0 | 0
Nonrecurring fair value measurements |  |
Financial assets |  |
Reverse mortgage interests, net | 5,460 | 6,279
Financial liabilities |  |
Unsecured senior notes | 2,167 | 2,366
Nonrecurring fair value measurements | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt | 3,676 | 4,299
Nonrecurring fair value measurements | Trust 2020-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 513 |
Nonrecurring fair value measurements | Trust 2019-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 257 | 331
Nonrecurring fair value measurements | Trust 2019-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 225 | 300
Nonrecurring fair value measurements | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt |  | 208
Nonrecurring fair value measurements | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt |  | 148
Nonrecurring fair value measurements | Level 1 |  |
Financial assets |  |
Reverse mortgage interests, net | 0 | 0
Financial liabilities |  |
Unsecured senior notes | 2,237 | 2,505
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 |
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 1 | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt |  | 0
Nonrecurring fair value measurements | Level 1 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt |  | 0
Nonrecurring fair value measurements | Level 2 |  |
Financial assets |  |
Reverse mortgage interests, net | 0 | 0
Financial liabilities |  |
Unsecured senior notes | 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 |
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 2 | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt |  | 0
Nonrecurring fair value measurements | Level 2 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt |  | 0
Nonrecurring fair value measurements | Level 3 |  |
Financial assets |  |
Reverse mortgage interests, net | 5,574 | 6,318
Financial liabilities |  |
Unsecured senior notes | 0 | 0
Nonrecurring fair value measurements | Level 3 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt | 3,679 | 4,299
Nonrecurring fair value measurements | Level 3 | Trust 2020-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 513 |
Nonrecurring fair value measurements | Level 3 | Trust 2019-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 257 | 331
Nonrecurring fair value measurements | Level 3 | Trust 2019-1 |  |
Financial liabilities |  |
Other nonrecourse debt | $ 225 | 300
Nonrecurring fair value measurements | Level 3 | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt |  | 208
Nonrecurring fair value measurements | Level 3 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt |  | $ 148

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