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SHARE-BASED COMPENSATION PLANS AND AWARDS Part 1 (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense recognized in selling, general and administrative expense $ 44 $ 59 $ 64
Share-based compensation expense, retirement eligibility preceding the requisite vesting period $ 1 3 3
Omnibus Long-Term Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Plan, term description Eastman's 2017 Omnibus Stock Compensation Plan ("2017 Omnibus Plan") was approved by stockholders at the May 4, 2017 Annual Meeting of Stockholders and shall remain in effect until its fifth anniversary.    
Shares reserved and available for issuance (in shares) 10,000,000    
Shares covered by full award value per share available for issuance $ 2.5    
Grant date exercise price, minimum exercise price not less than 100 percent of the per share fair market value on the date of the grant    
Director Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved and available for issuance (in shares) 10,000,000    
Term of service for shares of restricted stock to be granted to a non-employee director Shares of restricted stock are granted on the first day of a non-employee director's initial term of service and shares of restricted stock are granted each year to each non-employee director on the date of the annual meeting of stockholders.    
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense recognized in selling, general and administrative expense $ 7 $ 9 $ 9
Weighted average assumptions used to determine fair value of stock options awarded [Abstract]      
Expected volatility rate (in hundredths) 21.56% 19.80% 19.03%
Expected dividend yield (in hundredths) 3.30% 2.51% 2.48%
Average risk-free interest rate (in hundredths) 0.94% 2.44% 2.61%
Expected term years (in years) 5 years 10 months 24 days 5 years 8 months 12 days 5 years 1 month 6 days
Expected dividend yield calculation basis Company's average of the last four quarterly dividend yields    
Summary of activity of stock option awards [Roll Forward]      
Outstanding at beginning of period (in shares) 3,479,300 2,905,600 2,614,100
Granted (in shares) 622,000 786,000 619,700
Exercised (in shares) (568,800) (135,700) (323,000)
Cancelled forfeited or expired (in shares) (5,900) (76,600) (5,200)
Outstanding at end of period (in shares) 3,526,600 3,479,300 2,905,600
Options exercisable at period-end (in shares) 2,192,300 2,077,600 1,606,800
Available for grant at end of period (in shares) 4,046,748 6,085,857 8,174,614
Outstanding at beginning of period (in dollars per share) $ 80 $ 79 $ 70
Granted (in dollars per share) 62 81 104
Exercised (in dollars per share) 64 67 55
Cancelled, forfeited, or expired (in dollars per share) 82 88 78
Outstanding at end of year (in dollars per share) 79 80 79
Weighted average fair value of options granted (in dollars per share) $ 7.92 $ 13.12 $ 15.90
Intrinsic value of options exercised $ 14 $ 2 $ 15
Cash proceeds received from option exercises 36 9 18
Tax benefit of options exercised 2   3
Fair value of shares vested $ 9 $ 8 7
Stock Option [Member] | Director Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term life of options (in years) 10 years    
Vesting periods, maximum (in years) 3 years    
Nonvested Options [Member]      
Summary of activity of stock option awards [Roll Forward]      
Outstanding at beginning of period (in shares) 1,401,700    
Granted (in shares) 622,000    
Vested (in shares) (689,400)    
Outstanding at end of period (in shares) 1,334,300 1,401,700  
Outstanding at beginning of period (in dollars per share) $ 13.68    
Granted (in dollars per share) 7.92    
Vested (in dollars per share) 13.47    
Outstanding at end of year (in dollars per share) $ 11.11 $ 13.68  
Unrecognized compensation expense before tax for these same type awards $ 2    
Amortization life of unrecognized compensation expense before tax for these same type awards (in years) 2 years    
Other Share-Based Compensation Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense recognized in selling, general and administrative expense $ 37 $ 50 $ 55
Summary of activity of stock option awards [Roll Forward]      
Unrecognized compensation expense before tax for these same type awards $ 45    
Amortization life of unrecognized compensation expense before tax for these same type awards (in years) 2 years