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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, 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 |  |

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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