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SHARE-BASED COMPENSATION PLANS AND AWARDS Part 1 (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Period End Date	Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 74
Share-based compensation expense recognized in selling, general and administrative expense	$ 59	$ 64	$ 52
Share-based compensation expense, retirement eligibility preceding the requisite vesting period	$ 3	3	2
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 80
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	$ 9	$ 8
Weighted average assumptions used to determine fair value of stock options awarded [Abstract]
Expected volatility rate (in hundredths)	19.80%	19.03%	20.45%
Expected dividend yield (in hundredths)	2.51%	2.48%	2.64%
Average risk-free interest rate (in hundredths)	2.44%	2.61%	1.91%
Expected term years (in years)	5 years 8 months 12 days	5 years 1 month 6 days	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)	2,905,600	2,614,100	2,363,700
Granted (in shares)	786,000	619,700	745,800
Exercised (in shares)	(135,700)	(323,000)	(489,300)
Cancelled forfeited or expired (in shares)	(76,600)	(5,200)	(6,100)
Outstanding at end of period (in shares)	3,479,300	2,905,600	2,614,100
Options exercisable at period-end (in shares)	2,077,600	1,606,800	1,335,500
Available for grant at end of period (in shares)	6,085,857	8,174,614	9,943,033
Outstanding at beginning of period (in dollars per share)	$ 79	$ 70	$ 61
Granted (in dollars per share)	81	104	80
Exercised (in dollars per share)	67	55	44
Cancelled, forfeited, or expired (in dollars per share)	88	78	74
Outstanding at end of year (in dollars per share)	80	79	70
Weighted average fair value of options granted (in dollars per share)	$ 13.12	$ 15.90	$ 11.79
Intrinsic value of options exercised	$ 2	$ 15	$ 19
Cash proceeds received from option exercises	9	18	22
Tax benefit of options exercised		3	5
Fair value of shares vested	$ 8	$ 7	$ 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)	P10Y
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)	1,298,800
Granted (in shares)	786,000
Vested (in shares)	(608,200)
Cancelled forfeited or expired (in shares)	(74,900)
Outstanding at end of period (in shares)	1,401,700	1,298,800
Outstanding at beginning of period (in dollars per share)	$ 13.63
Granted (in dollars per share)	13.12
Vested (in dollars per share)	12.89
Cancelled, forfeited, or expired (in dollars per share)	13.43
Outstanding at end of year (in dollars per share)	$ 13.68	$ 13.63
Unrecognized compensation expense before tax for these same type awards	$ 5
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	189,000	160,000	172,000
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	$ 50	$ 55	$ 44
Summary of activity of stock option awards [Roll Forward]
Unrecognized compensation expense before tax for these same type awards	$ 55
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 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
Performance Shares [Member] | Long term performance shares award 2019-2021 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	412,000

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