v3.26.3
EARNINGS AND DIVIDENDS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Earnings Per Share [Abstract]        
Net earnings attributable to Eastman $ 252 $ 69 $ 542 $ 391
Weighted average shares used for basic EPS (in shares) 114,300,000 114,400,000 114,300,000 114,900,000
Dilutive effect of stock options and other awards 1,000,000.0 1,000,000.0 1,000,000.0 1,100,000
Weighted average shares used for diluted EPS (in shares) 115,300,000 115,400,000 115,300,000 116,000,000.0
Earnings Per Share, Basic $ 2.21 $ 0.60 $ 4.75 $ 3.41
Earnings Per Share, Diluted $ 2.19 $ 0.60 $ 4.70 $ 3.38
Underlying options excluded from the computation of diluted earnings per share (in shares) 4,025,912 3,284,539 4,025,912 2,823,847
Cash dividends declared (per share) $ 0.84 $ 0.83 $ 2.52 $ 2.49
Shares repurchased (in shares) 0 776,977 0 1,420,768