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Debt And Lines Of Credit (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 29, 2012
Aug. 31, 2016
Jun. 10, 2014
Jan. 31, 2014
Schedule of Debt Activity [Line Items]                
Extinguishment of Debt, Amount   $ 1,625,000,000us-gaap_ExtinguishmentOfDebtAmount [1] $ 574,000,000us-gaap_ExtinguishmentOfDebtAmount [1] $ 1,272,000,000us-gaap_ExtinguishmentOfDebtAmount [1]        
Debt and capital lease obligations   5,300,000,000us-gaap_DebtAndCapitalLeaseObligations            
Principal payment of debt obligations to non-consolidated variable interest entities in 2016   5,200,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive            
Debt obligations offset against Class B interests   5,200,000,000ip_DebtObligationsOffsetAgainstPreferredInterest            
Maturities of long-term debt, 2013   742,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths            
Maturities of long-term debt, 2014   543,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo            
Maturities of long-term debt, 2015   71,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree            
Maturities of long-term debt, 2016   1,200,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour            
Maturities of long-term debt, 2017   605,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive            
Gains (Losses) on Extinguishment of Debt   276,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt [2] 25,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt [2] 48,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt [2]        
Debt tender premiums paid 258,000,000ip_Premiumspaidondebttender 269,000,000ip_Premiumspaidondebttender 0ip_Premiumspaidondebttender 0ip_Premiumspaidondebttender        
Three Point Six Five Percentage Fixed Rate Loan [Member] [Member]                
Schedule of Debt Activity [Line Items]                
Proceeds from Issuance of Unsecured Debt 800,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= ip_ThreePointSixFivePercentageFixedRateLoanMemberMember		              
Debt Instrument, Interest Rate, Stated Percentage             3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ip_ThreePointSixFivePercentageFixedRateLoanMemberMember		  
Maturity date, range low Jun. 15, 2024              
Four Point Eight Percentage Fixed Rate Loan [Member] [Member] [Member]                
Schedule of Debt Activity [Line Items]                
Proceeds from Issuance of Unsecured Debt 800,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= ip_FourPointEightPercentageFixedRateLoanMemberMemberMember		              
Debt Instrument, Interest Rate, Stated Percentage             4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ip_FourPointEightPercentageFixedRateLoanMemberMemberMember		  
Maturity date, range low Jun. 15, 2044              
Unsecured Debt [Member]                
Schedule of Debt Activity [Line Items]                
Extinguishment of Debt, Amount 960,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember		              
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 7.95%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember		              
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 9.38%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember		              
Debt Instrument Original Maturity Date Minimum 2018              
Debt Instrument Original Maturity Date Maximum 2019              
Gains (Losses) on Extinguishment of Debt 262,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_UnsecuredDebtMember		              
1.38% Variable Rate Term Loan [Member]                
Schedule of Debt Activity [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage         1.38%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ip_OnePointThreeEightPercentageVariableRateTermLoanMember		      
Long term debt, face amount         1,200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ip_OnePointThreeEightPercentageVariableRateTermLoanMember		      
Maturity date, range low         Feb. 13, 2017      
Repayment of loan       1,200,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= ip_OnePointThreeEightPercentageVariableRateTermLoanMember		        
1.75% Variable Rate Term Loan [Member]                
Schedule of Debt Activity [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage         1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ip_OnePointSevenFivePercentageVariableRateTermLoanMember		      
Long term debt, face amount         200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ip_OnePointSevenFivePercentageVariableRateTermLoanMember		      
Maturity date, range low         Feb. 13, 2017      
Repayment of loan   200,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= ip_OnePointSevenFivePercentageVariableRateTermLoanMember		            
Credit Facility Agreements [Member]                
Schedule of Debt Activity [Line Items]                
Contractually committed credit facilities   2,000,000,000ip_AvailableLiquidityFacilities
/ us-gaap_DebtInstrumentAxis
= us-gaap_CreditFacilityDomain		            
Revolving Credit Facility [Member]                
Schedule of Debt Activity [Line Items]                
Revolving credit facilities available   1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		            
Credit agreement facility fee   0.15%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember		            
Receivables Securitization Program [Member]                
Schedule of Debt Activity [Line Items]                
Commercial paper-based financings agreement value               500,000,000us-gaap_CollateralizedAgreements
/ us-gaap_DebtInstrumentAxis
= ip_ReceivablesSecuritizationProgramMember
Available commercial paper-based financings   $ 500,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= ip_ReceivablesSecuritizationProgramMember		            
Scenario, Forecast [Member] | Revolving Credit Facility [Member]                
Schedule of Debt Activity [Line Items]                
Line of credit, maturity date           Aug. 26, 2019    
[1] Reductions related to notes with interest rates ranging from 1.63% to 9.38% with original maturities from 2014 to 2041 for the years ended December 31, 2014, 2013 and 2012.
[2] Amounts are included in Restructuring and other charges in the accompanying consolidated statements of operations.