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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Data [Abstract]                      
Sales $ 2,205 $ 2,325 $ 2,363 $ 2,380 $ 2,376 $ 2,547 $ 2,621 $ 2,607 $ 9,273 $ 10,151 $ 9,549
Gross Profit 497 574 589 574 466 728 704 581 2,234 2,479 2,363
Asset impairments and restructuring charges (gains), net 74 2 18 32 39 0 4 2 126 45 8
Net earnings attributable to Eastman $ 26 $ 266 $ 258 $ 209 $ 34 $ 412 $ 344 $ 290 $ 759 $ 1,080 $ 1,384
Earnings Per Share [Abstract]                      
Basic earnings per share attributable to Eastman $ 0.19 [1] $ 1.95 [1] $ 1.87 [1] $ 1.50 [1] $ 0.25 [1] $ 2.93 [1] $ 2.42 [1] $ 2.03 [1] $ 5.52 [2] $ 7.65 [2] $ 9.56 [2]
Diluted earnings per share attributable to Eastman $ 0.19 [1] $ 1.93 [1] $ 1.85 [1] $ 1.49 [1] $ 0.24 [1] $ 2.89 [1] $ 2.39 [1] $ 2.00 [1] $ 5.48 [2] $ 7.56 [2] $ 9.47 [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.