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Reverse Mortgage Interests, Net - Unsecuritized Interest (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jul. 31, 2018
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Reverse Mortgage Interest [Abstract] |  |  |  |  |
Repurchased HECM loans (exceeds 98% MCA) | $ 874 |  | $ 949 |  |
HECM related receivables(1) | 289 |  | 300 |  |
Funded borrower draws not yet securitized | 92 |  | 76 |  |
REO-related receivables | 24 |  | 16 |  |
Purchase discount, net | (75) | $ (97) | (122) | $ (151) | $ (161)
Total unsecuritized interests | $ 1,204 |  | $ 1,219 |  |

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- Definition Reverse Mortgage Interest [Abstract] + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Funded Draws Not Yet Securitized + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Home Equity Conversion Mortgage Receivables + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Real Estate Owned Related Receivables + References No definition available. + Details
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- Definition Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Repurchase of Home Equity Conversion Mortgages + References No definition available. + Details
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