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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Interest income | $ 1,330,513 | $ 1,002,422 | $ 1,434,703
Net gains (losses) on disposal of investments | 661,513 | (47,944) | (1,123,969)
Net income (loss) attributable to Annaly | (891,163) | (2,162,865) | $ 54,408
Residential Mortgage Loans |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Interest income | 170,259 | 150,066 |
Net gains (losses) on disposal of investments | (38,372) | (18,619) |
Net unrealized gains (losses) on instruments measured at fair value through earnings | 37,693 | 51,290 |
Net income (loss) attributable to Annaly | $ 169,580 | $ 182,737 |

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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=121586364&loc=d3e3602-108585 + Details
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