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EARNINGS AND DIVIDENDS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Net earnings attributable to Eastman $ 258 $ 209
Weighted average shares used for basic EPS (in shares) 136,000,000.0 139,000,000.0
Dilutive effect of stock options and other awards 500,000 1,100,000
Weighted average shares used for diluted EPS (in shares) 136,500,000 140,100,000
Earnings Per Share, Basic $ 1.90 $ 1.50
Earnings Per Share, Diluted $ 1.89 $ 1.49
Underlying options excluded from the computation of diluted earnings per share (in shares) 3,921,686 2,261,873
Shares repurchased (in shares) 510,301 1,582,076
Cash dividends declared (per share) $ 0.66 $ 0.62