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RETIREMENT PLANS (Tables)

12 Months Ended

Dec. 31, 2024

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 2024 and 2023, the funded status of the plans and amounts recognized in the Consolidated Statements of Financial Position.

Summary of Changes

			Pension Plans																								Postretirement Benefit Plans
			2024												2023												2024						2023
(Dollars in millions)			U.S.						Non-U.S.						U.S.						Non-U.S.
Change in projected benefit obligation:
Benefit obligation, beginning of year			$	1,468					$	661					$	1,471					$	602					$	480					$	509
Service cost			21						9						23						7						$	—					—
Interest cost			73						24						77						26						$	24					26
Actuarial loss (gain)			(29)						(55)						54						36						$	(17)					(11)
Settlement			—						—						—						(11)						$	—					—
Plan participants' contributions			—						1						—						1						$	2					2
Effect of currency exchange			—						(25)						—						27						$	—					—
Benefits paid			(148)						(23)						(157)						(27)						(43)						(46)
Benefit obligation, end of year			$	1,385					$	592					$	1,468					$	661					$	446					$	480
Change in plan assets:
Fair value of plan assets, beginning of year			$	1,348					$	639					$	1,405					$	589					$	104					$	106
Actual return on plan assets			62						16						93						40						$	3					12
Effect of currency exchange			—						(26)						—						27						$	—					—
Company contributions			4						17						7						20						$	35					35
Reserve for third party contributions			—						—						—						—						$	—					(5)
Plan participants' contributions			—						1						—						1						$	2					2
Benefits paid			(148)						(23)						(157)						(27)						$	(43)					(46)
Settlements			—						—						—						(11)						—						—
Fair value of plan assets, end of year			$	1,266					$	624					$	1,348					$	639					$	101					$	104
Funded status at end of year			$	(119)					$	32					$	(120)					$	(22)					$	(345)					$	(376)
Amounts recognized in the Consolidated Statements of Financial Position consist of:
Other noncurrent assets			$	—					$	58					$	—					$	18					$	57					$	56
Current liabilities			(4)						—						(3)						—						(36)						(36)
Post-employment obligations			(115)						(26)						(117)						(40)						(366)						(396)
Net amount recognized, end of year			$	(119)					$	32					$	(120)					$	(22)					$	(345)					$	(376)
Accumulated benefit obligation			$	1,324					$	569					$	1,404					$	635
Amounts recognized in accumulated other comprehensive income consist of:
Prior service (credit) cost			$	—					$	(5)					$	—					$	(6)					$	—					$	(10)

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)			2024												2023
			U.S.						Non-U.S.						U.S.						Non-U.S.
Projected benefit obligation			$	1,385					$	79					$	1,468					$	434
Fair value of plan assets			1,266						53						1,348						394

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)			2024												2023
			U.S.						Non-U.S.						U.S.						Non-U.S.
Accumulated benefit obligation			$	1,324					$	55					$	1,404					$	408
Fair value of plan assets			1,266						40						1,348						385

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
			2024												2023												2022												2024						2023						2022
(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			$	21					$	9					$	23					$	7					$	25					$	11					$	—					$	—					$	—
Interest cost			73						24						77						26						45						14						24						26						14
Expected return on plan assets			(95)						(28)						(88)						(22)						(128)						(31)						(5)						(4)						(4)
Amortization of:
Prior service (credit) cost			—						(1)						—						—						1						—						(10)						(27)						(31)
Mark-to-market pension and other postretirement benefits loss (gain), net (1)			4						(43)						49						18						112						10						(15)						(14)						(103)
Net periodic benefit (credit) cost			$	3					$	(39)					$	61					$	29					$	55					$	4					$	(6)					$	(19)					$	(124)
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Curtailment gain			$	—					$	—					$	—					$	—					$	—					$	(4)					$	—					$	—					$	—
Amortization of:
Prior service (credit) cost			—						(1)						—						—						1						—						(10)						(27)						(31)
Total			$	—					$	(1)					$	—					$	—					$	1					$	(4)					$	(10)					$	(27)					$	(31)

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
			2024									2023									2022									2024						2023						2022
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			5.64		%	4.40		%				5.22		%	3.83		%				5.58		%	4.27		%				5.60		%				5.21		%				5.55		%
Interest crediting rate			5.44		%	N/A						5.46		%	N/A						5.48		%	N/A						N/A						N/A						N/A
Rate of compensation increase			3.00		%	3.04		%				3.00		%	3.04		%				3.00		%	3.04		%				N/A						N/A						N/A
Health care cost trend
Initial																														6.25		%				6.50		%				6.00		%
Decreasing to ultimate trend of																														5.00		%				5.00		%				5.00		%
in year																														2030						2030						2030
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			5.22		%	3.83		%				5.58		%	4.27		%				2.88		%	1.57		%				5.21		%				5.55		%				2.83		%
Discount rate for service cost			5.22		%	3.38		%				5.59		%	3.95		%				2.95		%	1.31		%				N/A						N/A						N/A
Discount rate for interest cost			5.15		%	3.83		%				5.46		%	4.27		%				2.46		%	1.57		%				5.16		%				5.43		%				2.35		%
Expected return on assets			7.50		%	4.74		%				6.62		%	3.86		%				7.07		%	3.81		%				4.50		%				3.50		%				3.50		%
Rate of compensation increase			3.00		%	3.04		%				3.00		%	3.04		%				3.00		%	3.00		%				N/A						N/A						N/A
Interest crediting rate			5.46		%	N/A						5.48		%	N/A						5.50		%	N/A						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

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, 2024
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)			$	18					$	40					$	18					$	40					$	—					$	—					$	—					$	—
Public Equity - United States (2)			6						—						6						—						—						—						—						—
Other Investments (3)			—						49						—						—						—						—						—						49
Total Assets at Fair Value			$	24					$	89					$	24					$	40					$	—					$	—					$	—					$	49
Investments Measured at Net Asset Value (4)			1,242						535
Total Assets			$	1,266					$	624

(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

(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, 2024
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:
Debt (1):
Fixed Income (U.S.)			$	64					$	—					$	64					$	—
Fixed Income (Non-U.S.)			22						—						22						—
Total			$	86					$	—					$	86					$	—

(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 (2)			$	2					$	2					$	—					$	—
Debt (1):
Fixed Income (U.S.)			65						—						65						—
Fixed Income (Non-U.S.)			22						—						22						—
Total			$	89					$	2					$	87					$	—

(1)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.

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

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, 2022						$	45
Unrealized gains						5
Purchases, issuances, sales, and settlements						1
Balance at December 31, 2023						51
Unrealized gains						(3)
Purchases, issuances, sales, and settlements						1
Balance at December 31, 2024						$	49

(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 2025 and the asset allocation at December 31, 2024 and 2023, by asset category.

			U.S. Pension Plans												Non-U.S. Pension Plans												Postretirement Benefit Plan
			2025 Target Allocation			Plan Assets at December 31, 2024			Plan Assets at December 31, 2023						2025 Target Allocation			Plan Assets at December 31, 2024			Plan Assets at December 31, 2023						2025 Target Allocation			Plan Assets at December 31, 2024			Plan Assets at December 31, 2023
Asset category
Equity securities			41%			42%			40%						25%			23%			22%						—%			—%			—%
Debt securities			36%			37%			39%						57%			60%			62%						100%			100%			100%
Real estate			8%			6%			6%						4%			4%			4%						—%			—%			—%
Other investments (1)			15%			15%			15%						14%			13%			12%						—%			—%			—%
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.
2025			$	142					$	24					$	44
2026			134						25						43
2027			132						29						43
2028			130						30						42
2029			133						32						41
2030-2034			607						176						184

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