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NET INCOME (LOSS) PER COMMON SHARE - Schedule of Net Income (Loss) per Share Reconciliation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income (loss) $ (294,848) $ 856,234 $ 1,456,286 $ (2,783,955)
Net income (loss) attributable to noncontrolling interests 794 32 1,115 98
Net income (loss) attributable to Annaly (295,642) 856,202 1,455,171 (2,784,053)
Dividends on preferred stock 26,883 35,509 53,766 71,018
Net income (loss) available (related) to common stockholders $ (322,525) $ 820,693 $ 1,401,405 $ (2,855,071)
Weighted average shares of common stock outstanding-basic (in shares) 1,410,239,138 1,423,909,112 1,404,755,496 1,427,451,716
Add: Effect of stock awards, if dilutive (in shares) 0 0 1,008,776 0
Weighted average shares of common stock outstanding-diluted (in shares) 1,410,239,138 1,423,909,112 1,405,764,272 1,427,451,716
Net income (loss) per share available (related) to common share        
Basic (in dollars per share) $ (0.23) $ 0.58 $ 1.00 $ (2.00)
Diluted (in dollars per share) $ (0.23) $ 0.58 $ 1.00 $ (2.00)