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SHARE-BASED COMPENSATION PLANS AND AWARDS Part 1 (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense recognized in selling, general and administrative expense $ 63 $ 64 $ 69
Share-based compensation expense, retirement eligibility preceding the requisite vesting period $ 6 6 7
Summary of activity of stock option awards [Roll Forward]      
Number Outstanding at end of period (in shares) 3,468,800    
Weighted-Average Remaining Contractual Life (in years) 5 years 4 months 24 days    
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price $ 89    
Number Exercisable at end of period (in shares) 2,691,100    
Weighted-Average Exercise Price (in dollars per share) $ 89    
Exercise price of options lower range (in dollars per share) 61    
Exercise prices of options upper range (in dollars per share) $ 121    
Exercise Prices of $61-$75      
Summary of activity of stock option awards [Roll Forward]      
Number Outstanding at end of period (in shares) 1,038,100    
Weighted-Average Remaining Contractual Life (in years) 3 years 10 months 24 days    
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price $ 71    
Number Exercisable at end of period (in shares) 1,007,100    
Weighted-Average Exercise Price (in dollars per share) $ 70    
Exercise price of options lower range (in dollars per share) 61    
Exercise prices of options upper range (in dollars per share) $ 75    
Exercise Prices of $76-$90      
Summary of activity of stock option awards [Roll Forward]      
Number Outstanding at end of period (in shares) 1,202,400    
Weighted-Average Remaining Contractual Life (in years) 6 years 10 months 24 days    
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price $ 84    
Number Exercisable at end of period (in shares) 571,000    
Weighted-Average Exercise Price (in dollars per share) $ 83    
Exercise price of options lower range (in dollars per share) 76    
Exercise prices of options upper range (in dollars per share) $ 90    
Exercise Prices of $91-$105      
Summary of activity of stock option awards [Roll Forward]      
Number Outstanding at end of period (in shares) 882,600    
Weighted-Average Remaining Contractual Life (in years) 4 years 7 months 6 days    
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price $ 107    
Number Exercisable at end of period (in shares) 882,600    
Weighted-Average Exercise Price (in dollars per share) $ 107    
Exercise price of options lower range (in dollars per share) 91    
Exercise prices of options upper range (in dollars per share) $ 105    
Exercise Prices of $106-121      
Summary of activity of stock option awards [Roll Forward]      
Number Outstanding at end of period (in shares) 345,700    
Weighted-Average Remaining Contractual Life (in years) 7 years 2 months 12 days    
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price $ 121    
Number Exercisable at end of period (in shares) 230,400    
Weighted-Average Exercise Price (in dollars per share) $ 121    
Exercise price of options lower range (in dollars per share) 106    
Exercise prices of options upper range (in dollars per share) $ 121    
Omnibus Long-Term Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Plan, term description Eastman's 2021 Omnibus Stock Compensation Plan ("2021 Omnibus Plan") was approved by stockholders at the May 6, 2021 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 $ 8 $ 10 $ 11
Weighted average assumptions used to determine fair value of stock options awarded [Abstract]      
Expected volatility rate (in hundredths) 30.21% 30.55% 28.98%
Expected dividend yield (in hundredths) 3.82% 3.31% 2.57%
Average risk-free interest rate (in hundredths) 4.34% 4.13% 2.35%
Expected term years (in years) 6 years 8 months 12 days 6 years 4 months 24 days 6 years 4 months 24 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) 3,824,000 3,479,200 3,168,500
Granted (in shares) 390,900 409,300 443,100
Exercised (in shares) (561,900) (38,200) (122,700)
Cancelled forfeited or expired (in shares) (184,200) (26,300) (9,700)
Outstanding at end of period (in shares) 3,468,800 3,824,000 3,479,200
Options exercisable at period-end (in shares) 2,691,100 2,974,100 2,534,400
Available for grant at end of period (in shares) 5,008,575 6,698,702 8,355,640
Outstanding at beginning of period (in dollars per share) $ 88 $ 88 $ 84
Granted (in dollars per share) 86 85 113
Exercised (in dollars per share) 73 68 74
Cancelled, forfeited, or expired (in dollars per share) 95 94 87
Outstanding at end of year (in dollars per share) 89 88 88
Weighted average fair value of options granted (in dollars per share) $ 21.16 $ 21.67 $ 26.80
Intrinsic value of options exercised $ 16 $ 1 $ 6
Cash proceeds received from option exercises 41 3 10
Tax benefit of options exercised 2   1
Fair value of shares vested $ 9 $ 8 $ 8
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) 849,900    
Granted (in shares) 390,900    
Vested (in shares) (403,800)    
Cancelled forfeited or expired (in shares) (59,400)    
Outstanding at end of period (in shares) 777,600 849,900  
Outstanding at beginning of period (in dollars per share) $ 23.12    
Granted (in dollars per share) 21.16    
Vested (in dollars per share) 22.79    
Cancelled, forfeited, or expired (in dollars per share) 22.43    
Outstanding at end of year (in dollars per share) $ 22.35 $ 23.12  
Unrecognized compensation expense before tax for these same type awards $ 1    
Amortization life of unrecognized compensation expense before tax for these same type awards (in years) 2 years    
Restricted Stock Units (RSUs) [Member]      
Summary of activity of stock option awards [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 276,000 144,000 160,000
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 $ 54 $ 55 $ 58
Summary of activity of stock option awards [Roll Forward]      
Unrecognized compensation expense before tax for these same type awards $ 62    
Amortization life of unrecognized compensation expense before tax for these same type awards (in years) 2 years    
Performance Shares [Member] | Long Term Performance Share Award      
Summary of activity of stock option awards [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 339,000 406,000 288,000