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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net income (loss) $ 2,396,280 $ (889,772) $ (2,163,091)
Net income (loss) attributable to noncontrolling interests 6,384 1,391 (226)
Net income (loss) attributable to Annaly 2,389,896 (891,163) (2,162,865)
Dividends on preferred stock 107,532 142,036 136,576
Net income (loss) available (related) to common stockholders $ 2,282,364 $ (1,033,199) $ (2,299,441)
Weighted average shares of common stock outstanding-basic (in shares) 1,427,426,079 1,414,659,439 1,434,912,682
Add: Effect of stock awards, if dilutive (in shares) 1,142,924 0 0
Weighted average shares of common stock outstanding-diluted (in shares) 1,428,569,003 1,414,659,439 1,434,912,682
Net income (loss) per share available (related) to common share      
Basic (in dollars per share) $ 1.60 $ (0.73) $ (1.60)
Diluted (in dollars per share) $ 1.60 $ (0.73) $ (1.60)