Description of the Plan (Details) - EBP 002 - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
EBP, Description of Plan [Line Items]
Forfeiture account	$ 8,000	$ 275,000
Forfeitures applied to reduce Company contributions	$ 291,000
Employer contribution, RSC annual contribution percentage	5.00%
Participant contribution, automatic deferral rate	7.00%
Employer contribution, matching percentage	50.00%
Employer contribution, participant compensation matched, percentage	7.00%
Employer contribution, matching percentage, collective bargaining agreement	100.00%
Employer contribution, participant compensation matched, percentage, collective bargaining agreement	7.00%
Plan sponsor contributions	$ 57,029,000	55,794,000
Participant contribution, maximum deferral rate	40.00%
Participant rollover contributions	$ 11,000,000.0
Note receivable from participant, minimum borrowing amount	1,000
Note receivable from participant, maximum borrowing amount	$ 50,000
Note receivable from participant, maximum borrowing of non-forfeitable account, percentage	50.00%
Note receivable from participant, maximum borrowing term	5 years
Interest income from notes receivable	$ 4,150,000
Notes receivable from participants	50,066,000	$ 49,845,000
Involuntary cash-out limit	1,000
Hardship withdrawal, minimum	500
Dividends	11,507,000
Eastman ESOP Fund
EBP, Description of Plan [Line Items]
Dividends	$ 6,300,000
Minimum
EBP, Description of Plan [Line Items]
Participant loan, interest rate	4.25%	4.25%
Maximum
EBP, Description of Plan [Line Items]
Participant contribution, automatic deferral rate	15.00%	10.00%
Participant loan, interest rate	9.50%	9.50%
Participant Directed
EBP, Description of Plan [Line Items]
Plan sponsor contributions	$ 40,616,000	$ 40,331,000
Interest income from notes receivable	4,150,000
Notes receivable from participants	50,066,000	49,845,000
Dividends	5,180,000
Non-participant Directed
EBP, Description of Plan [Line Items]
Plan sponsor contributions	16,413,000	15,463,000
Interest income from notes receivable	0
Notes receivable from participants	0	$ 0
Dividends	$ 6,327,000

EBP, Employer Contribution, Annual Fixed Rate Contribution, Percentage

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- Definition

EBP, Employer Contribution, Matching Percentage, Collective Bargaining Agreement

+ References

No definition available.

+ Details

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- Definition

EBP, Employer Contribution, Participant Compensation Matched, Percentage, Collective Bargaining Agreement

+ References

No definition available.

+ Details

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- Definition

EBP, Involuntary Cash-out Limit

+ References

No definition available.

+ Details

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- Definition

EBP, Note Receivable from Participant, Account, Maximum Borrowing Term

+ References

No definition available.

+ Details

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- Definition

EBP, Participant Hardship Withdrawal, Minimum Amount

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

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Period Type:	duration

- Definition

Amount of increase in net asset available for benefit from interest income on note receivable from participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Amount of increase in net asset available for benefit from contribution transferred from another qualified plan or from individual retirement account of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Excludes contribution for participant transmitted by employer of participant in 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/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(4)(a)(1))
-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 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(4)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 4: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule III))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 5: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 50
-Paragraph 2B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477783/962-325-50-2B

Reference 6: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477063/962-205-45-7

+ Details

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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
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Amount of contribution receivable from employer of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Period Type:	instant

- Definition

Amount of decrease in forfeited nonvested account of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from employer contribution.

+ References

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Amount of unpaid principal plus accrued but unpaid interest for loan from participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

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- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.

+ References

+ Details

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- Definition

Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ 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

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- Details

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- Details

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