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Reverse Mortgage Interests, Net - Schedule of Reverse Mortgage Interest (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jul. 31, 2018
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Mortgage Servicing Rights [Line Items] |  |  |  |  |
Participating interests in HECM mortgage-backed securities (“HMBS”), including $14 and $58 purchase premium, respectively | $ 4,592 |  | $ 5,664 |  |
Other interests securitized, net of $63 and $100 purchase discount, respectively | 879 |  | 1,064 |  |
Unsecuritized interests, net of $75 and $122 purchase discount, respectively | 1,204 |  | 1,219 |  |
Reserves | (13) | $ (8) | (13) | $ (1) | $ 0
Total reverse mortgage interests, net | 6,662 |  | 7,934 |  |
Other interests securitized, discount | 63 | 84 | 100 | 117 | 117
Unsecuritized interests, discount | 75 | $ 97 | 122 | $ 151 | $ 161
Mortgage-backed debt |  |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |  |
Debt premium | $ 14 |  | $ 58 |  |

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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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