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EARNINGS AND DIVIDENDS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Net earnings attributable to Eastman $ 258 $ 344 $ 467 $ 634
Weighted average shares used for basic EPS (in shares) 137,800,000 141,900,000 138,400,000 142,300,000
Dilutive effect of stock options and other awards 1,300,000 2,100,000 1,300,000 2,100,000
Weighted average shares used for diluted EPS (in shares) 139,100,000 144,000,000.0 139,700,000 144,400,000
Earnings Per Share, Basic $ 1.87 $ 2.42 $ 3.37 $ 4.45
Earnings Per Share, Diluted $ 1.85 $ 2.39 $ 3.34 $ 4.39
Underlying options excluded from the computation of diluted earnings per share (in shares) 2,242,478 407,573 2,242,478 407,573
Shares repurchased (in shares) 1,667,710 1,415,539 3,249,786 2,409,774
Cash dividends declared (per share) $ 0.62 $ 0.56 $ 1.24 $ 1.12