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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets |  |
Reverse mortgage interests, net | $ 5,709 | $ 6,279
Mortgage loans held for sale | 3,179 | 4,077
Derivative financial instruments | 391 | 153
Financial liabilities |  |
Unsecured senior notes | 2,261 | 2,366
Advance facilities | 475 | 422
Warehouse facilities | 4,031 | 4,575
Mortgage servicing rights financing liability | 49 | 37
Excess spread financing | 1,124 | 1,311
Derivative financial instruments | 50 | 15
Other nonrecourse debt | 4,707 | 5,286
Recurring Fair Value Measurements |  |
Financial assets |  |
Cash and cash equivalents | 1,041 | 329
Restricted cash | 260 | 283
Advances and other receivables, net | 668 | 988
Mortgage loans held for sale | 3,179 | 4,077
Derivative financial instruments | 391 | 153
Financial liabilities |  |
Advance facilities | 475 | 422
Warehouse facilities | 4,031 | 4,575
Mortgage servicing rights financing liability | 49 | 37
Excess spread financing | 1,124 | 1,311
Derivative financial instruments | 50 | 15
Recurring Fair Value Measurements | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 1,041 | 329
Restricted cash | 260 | 283
Advances and other receivables, net | 0 | 0
Mortgage loans held for sale | 0 | 0
Derivative financial instruments | 0 | 0
Financial liabilities |  |
Advance facilities | 0 | 0
Warehouse facilities | 0 | 0
Mortgage servicing rights financing liability | 0 | 0
Excess spread financing | 0 | 0
Derivative financial instruments | 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
Mortgage loans held for sale | 3,179 | 4,077
Derivative financial instruments | 3 | 153
Financial liabilities |  |
Advance facilities | 475 | 422
Warehouse facilities | 4,031 | 4,575
Mortgage servicing rights financing liability | 0 | 0
Excess spread financing | 0 | 0
Derivative financial instruments | 50 | 15
Recurring Fair Value Measurements | Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Advances and other receivables, net | 668 | 988
Mortgage loans held for sale | 0 | 0
Derivative financial instruments | 388 | 0
Financial liabilities |  |
Advance facilities | 0 | 0
Warehouse facilities | 0 | 0
Mortgage servicing rights financing liability | 49 | 37
Excess spread financing | 1,124 | 1,311
Derivative financial instruments | 0 | 0
Nonrecurring fair value measurements |  |
Financial assets |  |
Reverse mortgage interests, net | 5,709 | 6,279
Financial liabilities |  |
Unsecured senior notes | 2,261 | 2,366
Nonrecurring fair value measurements | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt | 3,886 | 4,299
Nonrecurring fair value measurements | Trust 2019-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 272 | 331
Nonrecurring fair value measurements | Trust 2019-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 243 | 300
Nonrecurring fair value measurements | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt | 179 | 208
Nonrecurring fair value measurements | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 127 | 148
Nonrecurring fair value measurements | Level 1 |  |
Financial assets |  |
Reverse mortgage interests, net | 0 | 0
Financial liabilities |  |
Unsecured senior notes | 2,307 | 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 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 | 0
Nonrecurring fair value measurements | Level 1 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 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 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 | 0
Nonrecurring fair value measurements | Level 2 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 0 | 0
Nonrecurring fair value measurements | Level 3 |  |
Financial assets |  |
Reverse mortgage interests, net | 5,736 | 6,318
Financial liabilities |  |
Unsecured senior notes | 0 | 0
Nonrecurring fair value measurements | Level 3 | Participating interest financing |  |
Financial liabilities |  |
Other nonrecourse debt | 3,857 | 4,299
Nonrecurring fair value measurements | Level 3 | Trust 2019-2 |  |
Financial liabilities |  |
Other nonrecourse debt | 272 | 331
Nonrecurring fair value measurements | Level 3 | Trust 2019-1 |  |
Financial liabilities |  |
Other nonrecourse debt | 243 | 300
Nonrecurring fair value measurements | Level 3 | Trust 2018-3 |  |
Financial liabilities |  |
Other nonrecourse debt | 179 | 208
Nonrecurring fair value measurements | Level 3 | Trust 2018-2 |  |
Financial liabilities |  |
Other nonrecourse debt | $ 127 | $ 148

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