DESCRIPTION OF THE PLAN (Details) - EBP 007	12 Months Ended
Dec. 31, 2025 USD ($) loan hardship yr	Dec. 31, 2024 USD ($)
EBP, Description of Plan [Line Items]
Automatic enrollment period following eligibility	45 days
Pretax, maximum annual compensation to total compensation, percentage	85.00%
Automatic deferral rate, annual increase	1.00%
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	$ 60,800	$ 286,900
Forfeited nonvested account, decrease from employer contribution	$ 4,402,000
Employer Matching Contribution, First Four Percent
EBP, Description of Plan [Line Items]
Matching percentage	70.00%
Participant compensation matched, percentage	4.00%
Employer Matching Contribution, Next Four Percent
EBP, Description of Plan [Line Items]
Matching percentage	50.00%
Participant compensation matched, percentage	4.00%
Retirement Savings Account Contribution, Under Age 40
EBP, Description of Plan [Line Items]
Annual retirement savings account contribution, percentage	3.00%
Retirement Savings Account Contribution, Age 40 Through 49
EBP, Description of Plan [Line Items]
Annual retirement savings account contribution, percentage	4.00%
Retirement Savings Account Contribution, Age 50 Through 54
EBP, Description of Plan [Line Items]
Annual retirement savings account contribution, percentage	5.00%
Retirement Savings Account Contribution, Age 55 And Above
EBP, Description of Plan [Line Items]
Annual retirement savings account contribution, percentage	6.00%
EBP, Employer, Common Stock Fund
EBP, Description of Plan [Line Items]
Pretax, maximum annual compensation to total compensation, percentage	50.00%
Minimum
EBP, Description of Plan [Line Items]
Automatic deferral rate	8.00%
Participant loan, interest rate	4.25%
Distribution installment period	5 years
Death benefit installment payment period	1 year
Maximum
EBP, Description of Plan [Line Items]
Automatic deferral rate	10.00%
Participant loan, interest rate	9.75%
Distribution installment period	20 years
Death benefit installment payment period	10 years

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

EBP, Employer Contribution, Annual Retirement Savings Account Contribution, Percentage

+ References

No definition available.

+ Details

Name:	ip_EBPEmployerContributionAnnualRetirementSavingsAccountContributionPercentage
Namespace Prefix:	ip_
Data Type:	dtr-types:percentItemType
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

Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold.

+ References

No definition available.

+ Details

Name:	ip_EBPParticipantContributionAutomaticAnnualIncreaseDeferralRate
Namespace Prefix:	ip_
Data Type:	dtr-types:percentItemType
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, 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

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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

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

- Details

Name:	dei_LegalEntityAxis=ip_EBP007Member
Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	ip_EBPEmployerContributionTypeAxis=ip_EBPRetirementSavingsAccountContributionUnderAge40Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ip_EBPEmployerContributionTypeAxis=ip_EBPRetirementSavingsAccountContributionAge40Through49Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ip_EBPEmployerContributionTypeAxis=ip_EBPRetirementSavingsAccountContributionAge50Through54Member
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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- Details

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