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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 454,156 | $ 152,394 | $ 177,381 | $ 218,491 | $ 272,900 | $ 315,623 | $ 334,114 | $ 512,066 | $ 1,002,422 | $ 1,434,703 | $ 1,484,772
Net gains (losses) on disposal of investments |  |  |  |  |  |  |  |  | (47,944) | (1,123,969) | (3,938)
Net income (loss) attributable to Annaly |  |  |  |  |  |  |  |  | (2,162,865) | 54,408 | $ 1,569,604
Residential Mortgage Loans |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 150,066 | 83,259 |
Net gains (losses) on disposal of investments |  |  |  |  |  |  |  |  | (18,619) | (12,934) |
Net unrealized gains (losses) on instruments measured at fair value through earnings |  |  |  |  |  |  |  |  | 51,290 | 1,102 |
Net income (loss) attributable to Annaly |  |  |  |  |  |  |  |  | $ 182,737 | $ 71,427 |

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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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