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QUARTERLY SALES AND EARNINGS DATA-UNAUDITED QUARTERLY SALES AND EARNINGS DATA-UNAUDITED (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Data [Abstract]                      
Sales $ 2,186 $ 2,122 $ 1,924 $ 2,241 $ 2,205 $ 2,325 $ 2,363 $ 2,380 $ 8,473 $ 9,273 $ 10,151
Gross Profit 526 501 371 577 497 574 589 574 1,975 2,234 2,479
Asset impairments and restructuring charges (gains), net 12 60 141 14 74 2 18 32 227 126 45
Net earnings attributable to Eastman $ 32 $ 161 $ 27 $ 258 $ 26 $ 266 $ 258 $ 209 $ 478 $ 759 $ 1,080
Earnings Per Share [Abstract]                      
Basic earnings per share attributable to Eastman $ 0.23 [1] $ 1.19 [1] $ 0.20 [1] $ 1.90 [1] $ 0.19 [1] $ 1.95 [1] $ 1.87 [1] $ 1.50 [1] $ 3.53 [2] $ 5.52 [2] $ 7.65 [2]
Diluted earnings per share attributable to Eastman $ 0.23 [1] $ 1.18 [1] $ 0.20 [1] $ 1.89 [1] $ 0.19 [1] $ 1.93 [1] $ 1.85 [1] $ 1.49 [1] $ 3.50 [2] $ 5.48 [2] $ 7.56 [2]
[1] Each quarter is calculated as a discrete period; the sum of the four quarters may not equal the calculated full year amount.
[2] EPS is calculated using whole dollars and shares.