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SHARE-BASED COMPENSATION PLANS AND AWARDS Part 1 (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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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

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