SHARE-BASED COMPENSATION PLANS AND AWARDS Part 1 (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 70
Share-based compensation expense recognized in selling, general and administrative expense	$ 64	$ 52	$ 36
Share-based compensation expense, retirement eligibility preceding the requisite vesting period	$ 3	2	2
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 79
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	$ 9	$ 8	$ 7
Weighted average assumptions used to determine fair value of stock options awarded [Abstract]
Expected volatility rate (in hundredths)	19.03%	20.45%	23.71%
Expected dividend yield (in hundredths)	2.48%	2.64%	2.31%
Average risk-free interest rate (in hundredths)	2.61%	1.91%	1.23%
Expected term years (in years)	5 years 1 month	5 years	5 years
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)	2,614,100	2,363,700	2,434,600
Granted (in shares)	619,700	745,800	554,000
Exercised (in shares)	(323,000)	(489,300)	(618,500)
Cancelled forfeited or expired (in shares)	(5,200)	(6,100)	(6,400)
Outstanding at end of period (in shares)	2,905,600	2,614,100	2,363,700
Options exercisable at period-end (in shares)	1,606,800	1,335,500	1,378,000
Available for grant at end of period (in shares)	8,174,614	9,943,033	3,807,724
Outstanding at beginning of period (in dollars per share)	$ 70	$ 61	$ 53
Granted (in dollars per share)	104	80	65
Exercised (in dollars per share)	55	44	33
Cancelled, forfeited, or expired (in dollars per share)	78	74	77
Outstanding at end of year (in dollars per share)	79	70	61
Weighted average fair value of options granted (in dollars per share)	$ 15.90	$ 11.79	$ 10.97
Intrinsic value of options exercised	$ 15	$ 19	$ 23
Cash proceeds received from option exercises	18	22	21
Tax benefit of options exercised	3	5	7
Fair value of shares vested	$ 7	$ 6	$ 6
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
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)	1,278,600
Granted (in shares)	619,700
Vested (in shares)	(594,300)
Cancelled forfeited or expired (in shares)	(5,200)
Outstanding at end of period (in shares)	1,298,800	1,278,600
Outstanding at beginning of period (in dollars per share)	$ 11.82
Granted (in dollars per share)	15.90
Vested (in dollars per share)	12.10
Cancelled, forfeited, or expired (in dollars per share)	12.74
Outstanding at end of year (in dollars per share)	$ 13.63	$ 11.82
Unrecognized compensation expense before tax for these same type awards	$ 3
Amortization life of unrecognized compensation expense before tax for these same type awards (in years)	2 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	160,000	172,000	190,000
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	$ 55	$ 44	$ 29
Summary of activity of stock option awards [Roll Forward]
Unrecognized compensation expense before tax for these same type awards	$ 60
Amortization life of unrecognized compensation expense before tax for these same type awards (in years)	2 years
Performance Shares [Member] \| Long term performance shares award 2016-2018 cycle [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	427,000
Performance Shares [Member] \| Long term performance shares award 2017-2019 cycle [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	357,000
Performance Shares [Member] \| Long term performance shares award 2018-2020 cycle [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	310,000

Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number

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For a share based compensation arrangement plan, the assumption basis for calculating the expected dividend yield.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees, due to retirement eligibility preceding the requisite vesting period.

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Description of pertinent provisions of equity-based compensation award exercise price as of the date of award grant.

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The policy, if any, for issuing shares or units upon exercise or conversion of equity-based awards into shares of stock or units, including the source of those shares or units (that is, new share, treasury shares, new units or treasury units).

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The maximum period of time an equity-based award can be outstanding.

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Shares covered by full value (e.g., performance shares and restricted stock awards) are counted against the total number of shares available for issuance based on delivery under the plan as this number of shares for every available under the award.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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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.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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