Investments (Details) - EBP 002 - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	$ 3,525,342	$ 3,434,960
Dividends	11,507
Cash and Cash Equivalents
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	4,563	5,617
Common stock - Eastman Chemical Company
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	216,548	265,688
Common stock - other
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	124,441	121,904
Mutual funds
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	178,543	169,871
Collective investment trusts
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	2,445,950	2,213,427
Managed Income Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	365,774	479,647
Self-directed brokerage account
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	$ 189,523	$ 178,806
Eastman Stock Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Number of shares purchased (in shares)	987,100
Number of shares sold (in shares)	452,534
Number of shares purchased, price per share (in dollars per share)	$ 70.41
Number of shares sold, price per share (in dollars per share)	$ 75.50
Dividends	$ 4,700
Eastman ESOP Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Number of shares purchased (in shares)	218,100
Number of shares sold (in shares)	269,513
Number of shares purchased, price per share (in dollars per share)	$ 92.51
Number of shares sold, price per share (in dollars per share)	$ 76.38
Dividends	$ 6,300

EBP, Investment, Purchased, Price Per Share

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- Definition

EBP, Investment, Sold, Price Per Share

+ References

No definition available.

+ Details

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- Definition

Amount of increase in net asset available for benefit from dividend income on investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(1)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477783/962-325-50-7

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477063/962-205-45-7

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- Definition

Fair and contract value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-03)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

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- Definition

Number of shares or units of investment purchased by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

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- Definition

Number of shares or units of investment sold by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(D)
-Publisher DOL-EBSA

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(A)
-Publisher DOL-EBSA

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(C)
-Publisher DOL-EBSA

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(B)
-Publisher DOL-EBSA

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