DESCRIPTION OF THE PLAN (Details) - EBP 118	12 Months Ended
Dec. 31, 2025 USD ($) loan hardship yr	Dec. 31, 2024 USD ($)
EBP, Description of Plan [Line Items]
Requisite service period	1 month
Automatic enrollment period following eligibility	45 days
Pretax, maximum annual compensation to total compensation, percentage	85.00%
Automatic deferral rate	6.00%
Common stock fund percentage of total account, percent threshold	50.00%
Vesting percentage	100.00%
Vesting period	3 years
Maximum vesting age \| yr	65
Maximum borrowing, to total account, percentage	50.00%
Maximum borrowing, amount	$ 50,000
Time period for loans used to reduce maximum borrowing amount	12 months
General loan, minimum borrowing term	1 year
General loan, maximum borrowing term	5 years
Primary residence, maximum borrowing term	30 years
Maximum number of loans outstanding \| loan	2
Maximum number of primary residence loans outstanding \| loan	1
Basis spread on variable rate	1.00%
Loan initiation fee	$ 50
Preceding period for general withdrawals	24 months
Annual number of hardship withdrawals, maximum \| hardship	3
Qualified birth and adoption withdrawals per child, maximum	$ 5,000
Eligibility period from birth or adoption date	1 year
Involuntary cash-out limit	$ 7,000
Involuntary cash-out threshold for automatic distribution to IRA	$ 0.01
Death benefit lump-sum payment period	10 years
Benefit liquidation period for minor eligible designated beneficiary	10 years
Benefit liquidation period for non-designated beneficiary	5 years
Threshold age of death for continued annual benefit payments to non-designated beneficiary \| yr	72
Forfeited nonvested account	$ 63,400	$ 160,600
Forfeited nonvested account, decrease from employer contribution	$ 3,261,000
EBP, General Employer Matching Contribution
EBP, Description of Plan [Line Items]
Matching percentage	50.00%
Participant compensation matched, percentage	6.00%
EBP, Employer Contribution, Hourly Non-Union Employee, Tranche 1
EBP, Description of Plan [Line Items]
Matching percentage	100.00%
Participant compensation matched, percentage	3.00%
EBP, Employer Contribution, Hourly Non-Union Employee, Tranche 2
EBP, Description of Plan [Line Items]
Matching percentage	50.00%
Participant compensation matched, percentage	3.00%
EBP, Employer, Common Stock Fund
EBP, Description of Plan [Line Items]
Pretax, maximum annual compensation to total compensation, percentage	50.00%
Maximum
EBP, Description of Plan [Line Items]
Automatic deferral rate	6.00%
Participant loan, interest rate	9.75%
Distribution installment period	20 years
Death benefit installment payment period	10 years
Minimum
EBP, Description of Plan [Line Items]
Automatic deferral rate	4.00%
Participant loan, interest rate	4.25%
Distribution installment period	5 years
Death benefit installment payment period	1 year

EBP, Annual Number Of Hardship Withdrawals, Maximum

No definition available.

Name:	ip_EBPAnnualNumberOfHardshipWithdrawalsMaximum
Namespace Prefix:	ip_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Automatic Enrollment Period Following Eligibility

+ References

No definition available.

+ Details

Name:	ip_EBPAutomaticEnrollmentPeriodFollowingEligibility
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Benefit Liquidation Period For Minor Eligible Designated Beneficiary

+ References

No definition available.

+ Details

Name:	ip_EBPBenefitLiquidationPeriodForMinorEligibleDesignatedBeneficiary
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Benefit Liquidation Period For Non-Designated Beneficiary

+ References

No definition available.

+ Details

Name:	ip_EBPBenefitLiquidationPeriodForNonDesignatedBeneficiary
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Death Benefit Installment Payment Period

+ References

No definition available.

+ Details

Name:	ip_EBPDeathBenefitInstallmentPaymentPeriod
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Death Benefit Lump-Sum Payment Period

+ References

No definition available.

+ Details

Name:	ip_EBPDeathBenefitLumpSumPaymentPeriod
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum Vesting age of participant for company contribution and/ or investment earning in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions.

+ References

No definition available.

+ Details

Name:	ip_EBPEmployerContributionMaximumVestingAge
Namespace Prefix:	ip_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age

+ References

No definition available.

+ Details

Name:	ip_EBPEmployerContributionVestingPercentage
Namespace Prefix:	ip_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions.

+ References

No definition available.

+ Details

Name:	ip_EBPEmployerContributionVestingServicePeriod
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Involuntary Cash-out Limit

+ References

No definition available.

+ Details

Name:	ip_EBPInvoluntaryCashOutLimit
Namespace Prefix:	ip_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

EBP, Involuntary Cash-out Threshold For Automatic Distribution To Individual Retirement Account

+ References

No definition available.

+ Details

Name:	ip_EBPInvoluntaryCashOutThresholdForAutomaticDistributionToIndividualRetirementAccount
Namespace Prefix:	ip_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term

+ References

No definition available.

+ Details

Name:	ip_EBPNoteReceivableFromParticipantAccountPrimaryResidenceMaximumBorrowingTerm
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Account, Time Period For Loans Used To Reduce Maximum Borrowing Amount

+ References

No definition available.

+ Details

Name:	ip_EBPNoteReceivableFromParticipantAccountTimePeriodForLoansUsedToReduceMaximumBorrowingAmount
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term

+ References

No definition available.

+ Details

Name:	ip_EBPNoteReceivableFromParticipantGeneralLoanMaximumBorrowingTerm
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, General Loan, Minimum Borrowing Term

+ References

No definition available.

+ Details

Name:	ip_EBPNoteReceivableFromParticipantGeneralLoanMinimumBorrowingTerm
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Loan Initiation Fee

+ References

No definition available.

+ Details

Name:	ip_EBPNoteReceivableFromParticipantLoanInitiationFee
Namespace Prefix:	ip_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Maximum Number Of Loans Outstanding

+ References

No definition available.

+ Details

Name:	ip_EBPNoteReceivableFromParticipantMaximumNumberOfLoansOutstanding
Namespace Prefix:	ip_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Maximum Number Of Primary Residence Loans Outstanding

+ References

No definition available.

+ Details

Name:	ip_EBPNoteReceivableFromParticipantMaximumNumberOfPrimaryResidenceLoansOutstanding
Namespace Prefix:	ip_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Common Stock Fund Percentage Of Total Account, Percent Threshold

+ References

No definition available.

+ Details

Name:	ip_EBPParticipantContributionCommonStockFundPercentageOfTotalAccountPercentThreshold
Namespace Prefix:	ip_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Loan, Basis Spread On Variable Rate

+ References

No definition available.

+ Details

Name:	ip_EBPParticipantLoanBasisSpreadOnVariableRate
Namespace Prefix:	ip_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Preceding Period For General Withdrawals

+ References

No definition available.

+ Details

Name:	ip_EBPPrecedingPeriodForGeneralWithdrawals
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Qualified Birth And Adoption Withdrawals, Eligibility Period From Birth Or Adoption Date

+ References

No definition available.

+ Details

Name:	ip_EBPQualifiedBirthAndAdoptionWithdrawalsEligibilityPeriodFromBirthOrAdoptionDate
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Qualified Birth And Adoption Withdrawals Per Child, Maximum

+ References

No definition available.

+ Details

Name:	ip_EBPQualifiedBirthAndAdoptionWithdrawalsPerChildMaximum
Namespace Prefix:	ip_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

EBP, Requisite Service Period

+ References

No definition available.

+ Details

Name:	ip_EBPRequisiteServicePeriod
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Termination, Distribution Installment Period

+ References

No definition available.

+ Details

Name:	ip_EBPTerminationDistributionInstallmentPeriod
Namespace Prefix:	ip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Threshold Age Of Death For Continued Annual Benefit Payments To Non-Designated Beneficiary

+ References

No definition available.

+ Details

Name:	ip_EBPThresholdAgeOfDeathForContinuedAnnualBenefitPaymentsToNonDesignatedBeneficiary
Namespace Prefix:	ip_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(5)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=ip_EBP118Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ip_EBPEmployerContributionTypeAxis=ip_EBPGeneralEmployerMatchingContributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ip_EBPEmployerContributionTypeAxis=ip_EBPEmployerContributionHourlyNonUnionEmployeeTranche1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ip_EBPEmployerContributionTypeAxis=ip_EBPEmployerContributionHourlyNonUnionEmployeeTranche2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: