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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Interest income | $ 51,553 | $ 218,491
Net gains (losses) on disposal of investments and other | 206,583 | (93,916)
Net income (loss) attributable to Annaly | (3,640,255) | (849,150)
Residential Mortgage Loans |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Interest income | 47,557 | 29,991
Net gains (losses) on disposal of investments and other | (12,000) | (5,223)
Net unrealized gains (losses) on instruments measured at fair value through earnings | (192,763) | 17,821
Net income (loss) attributable to Annaly | $ (157,206) | $ 42,589

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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