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EARNINGS AND DIVIDENDS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net earnings attributable to Eastman $ 140,000 $ 230,000 $ 322,000 $ 395,000
Weighted average shares used for basic EPS (in shares) 115,000,000.0 117,300,000 115,100,000 117,400,000
Dilutive effect of stock options and other awards 1,200,000 1,300,000 1,300,000 1,100,000
Weighted average shares used for diluted EPS (in shares) 116,200,000 118,600,000 116,400,000 118,500,000
Earnings Per Share, Basic $ 1.22 $ 1.96 $ 2.80 $ 3.37
Earnings Per Share, Diluted $ 1.20 $ 1.94 $ 2.77 $ 3.33
Underlying options excluded from the computation of diluted earnings per share (in shares) 3,264,994 1,336,652 1,772,176 1,397,081
Cash dividends declared (per share) $ 0.83 $ 0.81 $ 1.66 $ 1.62
Shares repurchased (in shares) 643,791 1,000,005 643,791 1,000,005
Stock Repurchased During Period, Value $ 50,000 $ 100,000 $ 50,000 $ 100,000