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EARNINGS AND DIVIDENDS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 01, 2021
Earnings Per Share [Abstract]            
Net earnings attributable to Eastman   $ 256 $ (146) $ 491 $ 128  
Weighted average shares used for basic EPS (in shares)   124,800,000 135,900,000 126,900,000 136,000,000.0  
Dilutive effect of stock options and other awards [1]   1,600,000 0 1,700,000 1,800,000  
Weighted average shares used for diluted EPS (in shares)   126,400,000 135,900,000 128,600,000 137,800,000  
Earnings Per Share, Basic   $ 2.05 $ (1.07) $ 3.87 $ 0.94  
Earnings Per Share, Diluted   $ 2.03 $ (1.07) $ 3.82 $ 0.93  
Underlying options excluded from the computation of diluted earnings per share (in shares)   1,342,328 327,782 507,692 0  
Shares repurchased (in shares)   6,118,034 833,580 6,666,069 1,188,375  
Cash dividends declared (per share)   $ 0.76 $ 0.69 $ 1.52 $ 1.38  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Underlying options excluded from the computation of diluted earnings per share (in shares)   1,342,328 327,782 507,692 0  
Shares repurchased (in shares)   6,118,034 833,580 6,666,069 1,188,375  
ASR Date Q2 2022            
Earnings Per Share [Abstract]            
Stock Repurchase Program, Authorized Amount   $ 500   $ 500    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Stock Repurchase Program, Authorized Amount   500   $ 500    
Payments for Repurchase of Equity   $ 500        
ASR Date Q2 2022 | Subsequent Event [Member]            
Earnings Per Share [Abstract]            
Shares repurchased (in shares) 1,212,732          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares repurchased (in shares) 1,212,732          
2021 Repurchase Program            
Earnings Per Share [Abstract]            
Stock Repurchase Program, Authorized Amount           $ 2,500
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Stock Repurchase Program, Authorized Amount           $ 2,500
[1] Dilutive effect is not applicable in a period with a net loss.