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RETIREMENT PLANS (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Schedule of Change in Benefit Obligation and Plan Assets, Funded Status and Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss)

Below is a summary balance sheet of the change in benefit obligation and plan assets during 2023 and 2022, the funded status of the plans and amounts recognized in the Consolidated Statements of Financial Position.

Summary of Changes

			Pension Plans																								Postretirement Benefit Plans
			2023												2022												2023						2022
(Dollars in millions)			U.S.						Non-U.S.						U.S.						Non-U.S.
Change in projected benefit obligation:
Benefit obligation, beginning of year			$	1,471					$	602					$	1,892					$	948					$	509					$	665
Service cost			23						7						25						11						—						—
Interest cost			77						26						45						14						26						14
Actuarial loss (gain)			54						36						(328)						(264)						(11)						(127)
Curtailment gain			—						—						—						(3)						—						—
Settlement			—						(11)						(9)						—						—						—
Plan participants' contributions			—						1						—						1						2						2
Effect of currency exchange			—						27						—						(77)						—						—
Benefits paid			(157)						(27)						(154)						(28)						(46)						(45)
Benefit obligation, end of year			$	1,468					$	661					$	1,471					$	602					$	480					$	509
Change in plan assets:
Fair value of plan assets, beginning of year			$	1,405					$	589					$	1,877					$	924					$	106					$	134
Actual return on plan assets			93						40						(312)						(250)						12						(31)
Effect of currency exchange			—						27						—						(76)						—						—
Company contributions			7						20						3						18						35						35
Reserve for third party contributions			—						—						—						—						(5)						11
Plan participants' contributions			—						1						—						1						2						2
Benefits paid			(157)						(27)						(154)						(28)						(46)						(45)
Settlements			—						(11)						(9)						—						—						—
Fair value of plan assets, end of year			$	1,348					$	639					$	1,405					$	589					$	104					$	106
Funded status at end of year			$	(120)					$	(22)					$	(66)					$	(13)					$	(376)					$	(403)
Amounts recognized in the Consolidated Statements of Financial Position consist of:
Other noncurrent assets			$	—					$	18					$	—					$	23					$	56					$	53
Current liabilities			(3)						—						(13)						—						(36)						(38)
Post-employment obligations			(117)						(40)						(53)						(36)						(396)						(418)
Net amount recognized, end of year			$	(120)					$	(22)					$	(66)					$	(13)					$	(376)					$	(403)
Accumulated benefit obligation			$	1,404					$	635					$	1,417					$	578
Amounts recognized in accumulated other comprehensive income consist of:
Prior service (credit) cost			$	—					$	(6)					$	—					$	(6)					$	(10)					$	(37)

Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block]

Information for pension plans with projected benefit obligations in excess of plan assets:

(Dollars in millions)			2023												2022
			U.S.						Non-U.S.						U.S.						Non-U.S.
Projected benefit obligation			$	1,468					$	434					$	1,471					$	176
Fair value of plan assets			1,348						394						1,405						140

Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]

Information for pension plans with accumulated benefit obligations in excess of plan assets:

(Dollars in millions)			2023												2022
			U.S.						Non-U.S.						U.S.						Non-U.S.
Accumulated benefit obligation			$	1,404					$	408					$	245					$	141
Fair value of plan assets			1,348						385						188						116

Schedule of Benefit Cost and Amounts Recognized in Other Comprehensive Income

Summary of Benefit Costs and Other Amounts Recognized in Other Comprehensive Income

			Pension Plans																																				Postretirement Benefit Plans
			2023												2022												2021												2023						2022						2021
(Dollars in millions)			U.S.						Non-U.S.						U.S.						Non-U.S.						U.S.						Non-U.S.
Components of net periodic benefit (credit) cost:
Service cost			$	23					$	7					$	25					$	11					$	26					$	19					$	—					$	—					$	—
Interest cost			77						26						45						14						37						12						26						14						12
Expected return on plan assets			(88)						(22)						(128)						(31)						(126)						(37)						(4)						(4)						(5)
Amortization of:
Prior service (credit) cost			—						—						1						—						—						(1)						(27)						(31)						(37)
Mark-to-market pension and other postretirement benefits loss (gain), net (1)			49						18						112						10						(170)						(62)						(14)						(103)						(35)
Net periodic benefit (credit) cost			$	61					$	29					$	55					$	4					$	(233)					$	(69)					$	(19)					$	(124)					$	(65)
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Curtailment gain			$	—					$	—					$	—					$	(4)					$	—					$	—					$	—					$	—					$	—
Amortization of:
Prior service (credit) cost			—						—						1						—						—						(1)						(27)						(31)						(37)
Total			$	—					$	—					$	1					$	(4)					$	—					$	(1)					$	(27)					$	(31)					$	(37)

Schedule of Assumptions Used to Develop the Projected Benefit Obligation

The assumptions used to develop the projected benefit obligation for Eastman's significant U.S. and non-U.S. defined benefit pension plans and U.S. postretirement benefit plans are provided in the following tables.

			Pension Plans																											Postretirement Benefit Plans
			2023									2022									2021									2023						2022						2021
Weighted-average assumptions used to determine benefit obligations for years ended December 31:			U.S.			Non-U.S.						U.S.			Non-U.S.						U.S.			Non-U.S.
Discount rate			5.22		%	3.83		%				5.58		%	4.27		%				2.88		%	1.57		%				5.21		%				5.55		%				2.83		%
Interest crediting rate			5.46		%	N/A						5.48		%	N/A						5.50		%	N/A						N/A						N/A						N/A
Rate of compensation increase			3.00		%	3.04		%				3.00		%	3.04		%				3.00		%	3.00		%				N/A						N/A						N/A
Health care cost trend
Initial																														6.50		%				6.00		%				6.00		%
Decreasing to ultimate trend of																														5.00		%				5.00		%				5.00		%
in year																														2030						2030						2026
Weighted-average assumptions used to determine net periodic cost for years ended December 31:			U.S.			Non-U.S.						U.S.			Non-U.S.						U.S.			Non-U.S.
Discount rate			5.58		%	4.27		%				2.88		%	1.57		%				2.48		%	1.08		%				5.55		%				2.83		%				2.39		%
Discount rate for service cost			5.59		%	3.95		%				2.95		%	1.31		%				2.57		%	1.08		%				N/A						N/A						1.90		%
Discount rate for interest cost			5.46		%	4.27		%				2.46		%	1.57		%				1.79		%	1.08		%				5.43		%				2.35		%				1.74		%
Expected return on assets			6.62		%	3.86		%				7.07		%	3.81		%				7.29		%	4.04		%				3.50		%				3.50		%				3.75		%
Rate of compensation increase			3.00		%	3.04		%				3.00		%	3.00		%				2.75		%	2.94		%				N/A						N/A						N/A
Interest crediting rate			5.48		%	N/A						5.50		%	N/A						5.50		%	N/A						N/A						N/A						N/A
Health care cost trend
Initial																														6.00		%				6.00		%				6.25		%
Decreasing to ultimate trend of																														5.00		%				5.00		%				5.00		%
in year																														2030						2026						2026

Schedule of Fair Value Measurements of Pension Plan Assets on a Recurring Basis

The following tables reflect the fair value of the defined benefit pension plans assets.

(Dollars in millions)															Fair Value Measurements at December 31, 2023
Description			Total Fair Value												Quoted Prices in Active Markets for Identical Assets (Level 1)												Significant Other Observable Inputs (Level 2)												Significant Unobservable Inputs (Level 3)
Pension Assets:			U.S.						Non-U.S.						U.S.						Non-U.S.						U.S.						Non-U.S.						U.S.						Non-U.S.
Cash and Cash Equivalents (1)			$	25					$	49					$	25					$	49					$	—					$	—					$	—					$	—
Public Equity - United States (2)			4						—						4						—						—						—						—						—
Other Investments (3)			—						51						—						—						—						—						—						51
Total Assets at Fair Value			$	29					$	100					$	29					$	49					$	—					$	—					$	—					$	51
Investments Measured at Net Asset Value (4)			1,319						539
Total Assets			$	1,348					$	639

(Dollars in millions)															Fair Value Measurements at December 31, 2022
Description			Total Fair Value												Quoted Prices in Active Markets for Identical Assets (Level 1)												Significant Other Observable Inputs (Level 2)												Significant Unobservable Inputs (Level 3)
Pension Assets:			U.S.						Non-U.S.						U.S.						Non-U.S.						U.S.						Non-U.S.						U.S.						Non-U.S.
Cash and Cash Equivalents (1)			$	27					$	46					$	27					$	46					$	—					$	—					$	—					$	—
Public Equity - United States (2)			4						—						4						—						—						—						—						—
Other Investments (3)			—						45						—						—						—						—						—						45
Total Assets at Fair Value			$	31					$	91					$	31					$	46					$	—					$	—					$	—					$	45
Investments Measured at Net Asset Value (4)			1,374						498
Total Assets			$	1,405					$	589

(1)Cash and Cash Equivalents: Funds generally invested in actively managed collective trust funds or interest bearing accounts.

(2)Public Equity - United States: Common stock equity securities which are primarily valued using a market approach based on the quoted market prices.

(3)Other Investments: Primarily consist of insurance contracts which are generally valued using a crediting rate that approximates market returns and investments in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.

(4)Investments Measured at Net Asset Value: The underlying debt, public equity, and public real asset investments in this category are generally held in common trust funds, which are either actively or passively managed investment vehicles, that are valued at the net asset value per unit/share multiplied by the number of units/shares held as of the measurement date. The other alternative investments in this category are valued under the practical expedient method which is based on the most recently reported net asset value provided by the management of each private investment fund, adjusted as appropriate, for any lag between the date of the financial reports and the measurement date.

The following tables reflect the fair value of the postretirement benefit plan assets. The postretirement benefit plan is for the voluntary employees' beneficiary association ("VEBA") trust the Company assumed as part of the Solutia acquisition.

(Dollars in millions)									Fair Value Measurements at  December 31, 2023
Description			Total Fair Value						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Postretirement Benefit Plan Assets:
Cash and Cash Equivalents (1)			$	2					$	2					$	—					$	—
Debt (2):
Fixed Income (U.S.)			65						—						65						—
Fixed Income (Non-U.S.)			22						—						22						—
Total			$	89					$	2					$	87					$	—

(Dollars in millions)									Fair Value Measurements at December 31, 2022
Description			Total Fair Value						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Postretirement Benefit Plan Assets:
Cash and Cash Equivalents (1)			$	5					$	5					$	—					$	—
Debt (2):
Fixed Income (U.S.)			62						—						62						—
Fixed Income (Non-U.S.)			21						—						21						—
Total			$	88					$	5					$	83					$	—

(1)Cash and Cash Equivalents: Funds generally invested in actively managed collective trust funds or interest bearing accounts.

(2)Debt: The fixed income securities are primarily valued upon a market approach, using matrix pricing and considering a security's relationship to other securities for which quoted prices in an active market may be available, or an income approach, converting future cash flows to a single present value amount. Inputs used in developing fair value estimates include reported trades, broker quotes, benchmark yields, and base spreads.

Schedule of Pension Plan Assets Classified within Level 3 of the Fair Value Hierarchy

The Company valued assets with unobservable inputs (Level 3), primarily insurance contracts, using a crediting rate that approximates market returns and investments in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.

						Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
						Other Investments(1)
(Dollars in millions)						Non-U.S. Pension Plans
Balance at December 31, 2021						$	59
Unrealized losses						(14)
Balance at December 31, 2022						45
Unrealized gains						5
Purchases, issuances, sales, and settlements						1
Balance at December 31, 2023						$	51

(1)Primarily consists of insurance contracts.

Schedule of US and Non-US Pension Plans Asset Target Allocation by Category

The following table reflects the target allocation for the Company's U.S. and non-U.S. pension and postretirement benefit plans assets for 2024 and the asset allocation at December 31, 2023 and 2022, by asset category.

			U.S. Pension Plans												Non-U.S. Pension Plans												Postretirement Benefit Plan
			2024 Target Allocation			Plan Assets at December 31, 2023			Plan Assets at December 31, 2022						2024 Target Allocation			Plan Assets at December 31, 2023			Plan Assets at December 31, 2022						2024 Target Allocation			Plan Assets at December 31, 2023			Plan Assets at December 31, 2022
Asset category
Equity securities			41%			40%			36%						22%			22%			20%						—%			—%			—%
Debt securities			35%			39%			39%						62%			62%			62%						100%			100%			100%
Real estate			7%			6%			7%						4%			4%			4%						—%			—%			—%
Other investments (1)			17%			15%			18%						12%			12%			14%						—%			—%			—%
Total			100%			100%			100%						100%			100%			100%						100%			100%			100%

(1)U.S. primarily consists of private equity and natural resource and energy related limited partnership investments and public real assets. Non-U.S. primarily consists of annuity contracts and alternative investments.

Schedule Benefits Expected to be Paid from Pension Plans and Benefits

The estimated future benefit payments, reflecting expected future service, as appropriate, are as follows:

			Pension Plans												Postretirement  Benefit Plans
(Dollars in millions)			U.S.						Non-U.S.
2024			$	145					$	23					$	44
2025			137						25						44
2026			134						28						43
2027			133						32						43
2028			136						31						42
2029-2033			626						176						192

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