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Reverse Mortgage Interests, Net - Schedule of Reverse Mortgage Interest (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Mortgage Servicing Rights [Line Items] |  |  |  |  |  |  |
Participating interests in HECM mortgage-backed securities, net of $55 and $0 premium, respectively | $ 6,074 |  |  |  |  |  |
Other interests securitized, net of $117 and $0 discount, respectively | 1,003 |  |  |  |  |  |
Unsecuritized interests, net of $151 and $89 discount, respectively | 1,810 |  |  |  |  |  |
Reserves | (1) | $ 0 |  |  |  |  |
Total reverse mortgage interests, net | 8,886 |  |  |  |  |  |
Other interests securitized, discount | 117 | 117 |  |  |  |  |
Unsecuritized interests, discount | 151 | 161 |  |  |  |  |
Predecessor |  |  |  |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |  |  |  |
Participating interests in HECM mortgage-backed securities, net of $55 and $0 premium, respectively |  |  |  | $ 7,107 |  |  |
Other interests securitized, net of $117 and $0 discount, respectively |  |  |  | 912 |  |  |
Unsecuritized interests, net of $151 and $89 discount, respectively |  |  |  | 2,080 |  |  |
Reserves |  | $ (129) | $ (117) | (115) | $ (88) | $ (149) | $ (131)
Total reverse mortgage interests, net |  |  |  | 9,984 |  |  |
Debt premium |  |  |  | 62 |  |  |
Other interests securitized, discount |  |  |  | 0 |  |  |
Unsecuritized interests, discount |  |  |  | 89 |  |  |
Mortgage-backed debt |  |  |  |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |  |  |  |
Debt premium | $ 55 |  |  |  |  |  |
Mortgage-backed debt | Predecessor |  |  |  |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |  |  |  |
Debt premium |  |  |  | $ 0 |  |  |

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- Definition Amount, after accumulated amortization, of debt premium. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 + Details
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