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Reverse Mortgage Interests, Net - Schedule of Reverse Mortgage Interest (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Mortgage Servicing Rights [Line Items] |  |
Participating interests in HECM mortgage-backed securities (“HMBS”), net of $36 and $58 premium, respectively | $ 5,293 | $ 5,664
Other interests securitized, net of $112 and $100 discount, respectively | 950 | 1,064
Unsecuritized interests, net of $95 and $122 discount, respectively | 1,254 | 1,219
Reserves | (8) | (13)
Total reverse mortgage interests, net | 7,489 | 7,934
Other interests securitized, discount | 112 | 100
Unsecuritized interests, discount | 95 | 122
Mortgage-backed debt |  |
Mortgage Servicing Rights [Line Items] |  |
Debt premium | $ 36 | $ 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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