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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]  
Net Periodic Pension Expense For Qualified And Nonqualified U.S. Defined Benefit Plans [Table Text Block]
Net periodic pension expense for qualified and nonqualified U.S. and non-U.S. defined benefit plans comprised the following:

  202320222021
In millionsU.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Service cost$48 $4 $85 $3 $100 $5 
Interest cost459 3 338 2 333 4 
Expected return on plan assets(530)(1)(649)(1)(705)(7)
Actuarial loss (gain)93 (1)87 1 138 2 
Amortization of prior service cost23 — 23 — 22 — 
Special termination benefits1 — — — — — 
Net periodic pension (income) expense$94 $5 $(116)$5 $(112)$4 
Defined Benefit Plan, Plan Assets, Allocation [Table Text Block]
International Paper’s U.S. pension allocations by type of fund at December 31, 2023 and 2022 and target allocations were as follows:

Asset Class20232022Target
Allocations
Hedging assets66 %64 %
61% - 72%
Return seeking assets (a)34 %36 %
28% - 39%
Total100 %100 % 
Schedule of Allocation of Plan Assets [Table Text Block]
The fair values of International Paper’s pension plan assets at December 31, 2023 and 2022 by asset class are shown below. Hedge funds disclosed in the following table are allocated to hedging assets for target allocation purposes.

Fair Value Measurement at December 31, 2023
Asset ClassTotalQuoted
Prices
in
Active
Markets
For
Identical
Assets
(Level 1)		Significant
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
In millions        
Equities$1,336 $835 $501 $— 
Fixed income4,691 — 4,684 7 
Derivatives71 — — 71 
Cash and cash equivalents49 49 — — 
Other investments:
  Hedge funds1,293 
  Private equity644 
  Real estate funds752 
Total Investments$8,836 $884 $5,185 $78 

Fair Value Measurement at December 31, 2022
Asset ClassTotalQuoted
Prices in
Active
Markets
For
Identical
Assets
(Level 1)		Significant
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
In millions        
Equities$1,353 $889 $464 $— 
Fixed income4,550 — 4,543 7 
Derivatives25 — — 25 
Cash and cash equivalents82 82 — — 
Other investments:
  Hedge funds1,319 
  Private equity688 
  Real estate funds828 
Total Investments$8,845 $971 $5,007 $32 
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
Other Investments at December 31, 2023
InvestmentFair ValueUnfunded CommitmentsRedemption FrequencyRemediation Notice Period
In millions
Hedge funds$1,293 $103 Quarterly to semi-annually45 - 60 days
Private equity644 81 (a)None
Real estate funds752 94 Quarterly45 - 60 days
Total$2,689 $278 
(a) A private equity fund investment ("partnership interest") is contractually locked up for the life of the private equity fund by the partnership agreement. Limited partners do not have the option to redeem partnership interests.

Other Investments at December 31, 2022
InvestmentFair ValueUnfunded CommitmentsRedemption FrequencyRemediation Notice Period
In millions        
Hedge funds$1,319 $120 Daily to annually1 - 100 days
Private equity688 126 (a)None
Real estate funds828 129 Quarterly45 - 60 days
Total$2,835 $375 
(a) A private equity fund investment ("partnership interest") is contractually locked up for the life of the private equity fund by the partnership agreement. Limited partners do not have the option to redeem partnership interests.
Schedule of Derivative Instruments [Table Text Block]
The following tables summarize derivative holdings as of December 31, 2023 and 2022, respectively:

Derivatives at December 31, 2023
In millionsGross AssetGross LiabilityTotal
Collateral$7 $(7)$— 
Credit Default Swap2 — 2 
Interest Rate Swap4 — 4 
Bond/Equity Swap65 — 65 
Total$78 $(7)$71 

Derivatives at December 31, 2022
In millionsGross AssetGross LiabilityTotal
Collateral$9 $— $9 
Credit Default Swap1 — 1 
Interest Rate Swap16 — 16 
Bond/Equity Swap3 — 3 
Options6 (10)(4)
Total$35 $(10)$25 
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Table Text Block]
The following is a reconciliation of the assets that are classified using significant unobservable inputs (Level 3) at December 31, 2023:


Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
In millionsOther
fixed
income		DerivativesTotal
Beginning balance at December 31, 2021$16 $(21)$(5)
Actual return on plan assets:
Relating to assets still held at the reporting date(9)38 29 
Relating to assets sold during the period10 (189)(179)
Purchases, sales and settlements(10)197 187 
Transfers in and/or out of Level 3 — — — 
Ending balance at December 31, 2022$7 $25 $32 
Actual return on plan assets:
Relating to assets still held at the reporting date— 57 57 
Relating to assets sold during the period— 48 48 
Purchases, sales and settlements— (59)(59)
Transfers in and/or out of Level 3 — — — 
Ending balance at December 31, 2023$7 $71 $78 
Retirement Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
The following table shows the changes in the benefit obligation and plan assets for 2023 and 2022 and the plans’ funded status.
  20232022
In millionsU.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Change in projected benefit obligation:
Benefit obligation, January 1$8,816 $54 $11,833 $65 
Service cost48 4 85 3 
Interest cost459 3 338 2 
Actuarial loss (gain)225 (3)(2,863)(11)
Plan amendments26 — 16 — 
Benefits paid(593)(3)(593)(2)
Special termination benefits1 — — — 
Effect of foreign currency exchange rate movements— 3 — (3)
Benefit obligation, December 31$8,982 $58 $8,816 $54 
Change in plan assets:
Fair value of plan assets, January 1$8,845 $18 $12,075 $19 
Actual return on plan assets562 1 (2,666)— 
Company contributions22 3 29 2 
Benefits paid(593)(3)(593)(2)
Effect of foreign currency exchange rate movements— 1 — (1)
Fair value of plan assets, December 31$8,836 $20 $8,845 $18 
Funded status, December 31$(146)$(38)$29 $(36)
Amounts recognized in the consolidated balance sheet:
Overfunded pension plan assets$118 $— $297 $— 
Underfunded pension benefit obligation - current(20)(2)(22)(2)
Underfunded pension benefit obligation - non-current(244)(36)(246)(34)
 $(146)$(38)$29 $(36)
Schedule Of Amounts In Accumulated Other Comprehensive Income [Table Text Block]
Amounts recognized in accumulated other comprehensive income (loss) under ASC 715 (pre-tax):
Prior service cost (credit)$91 $— $89 $— 
Net actuarial loss (gain)1,663 (10)1,563 (7)
 $1,754 $(10)$1,652 $(7)
Pension Benefit Adjustments Recognized In Other Comprehensive (Loss) Income [Table Text Block]
The components of the $102 million and $(3) million related to U.S. plans and non-U.S. plans, respectively, in the amounts recognized in OCI during 2023 consisted of:
 
In millionsU.S.
Plans		Non-
U.S.
Plans
Current year actuarial (gain) loss$192 $(3)
Amortization of actuarial loss(93)1 
Current year prior service cost26 — 
Amortization of prior service cost(23)— 
Effect of foreign currency exchange rate movements— (1)
 $102 $(3)
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]
The following table summarizes information for pension plans with an accumulated benefit obligation in excess of plan assets at December 31, 2023 and 2022: 

  20232022
In millionsU.S.
Plans		Non-U.S.
Plans		U.S.
Plans		Non-U.S.
Plans
Projected benefit obligation$264 $57 $268 $54 
Accumulated benefit obligation264 49 268 45 
Fair value of plan assets— 20 — 18 
Defined Benefit Plan, Assumptions [Table Text Block]
Major actuarial assumptions used in determining the benefit obligations and net periodic pension cost for our defined benefit plans are presented in the following table:

  202320222021
  U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans		U.S.
Plans		Non-
U.S.
Plans
Actuarial assumptions used to determine benefit obligations as of December 31:
Discount rate5.10 %5.88 %5.40 %5.31 %2.90 %2.59 %
Rate of compensation increase3.00 %3.40 %3.00 %3.36 %3.00 %2.92 %
Actuarial assumptions used to determine net periodic pension cost for years ended December 31:
Discount rate (a)5.40 %5.31 %2.90 %2.59 %2.67 %2.32 %
Expected long-term rate of return on plan assets (a)6.50 %3.83 %6.00 %3.66 %6.40 %4.99 %
Rate of compensation increase3.00 %3.36 %3.00 %2.92 %2.25 %3.66 %
(a) Represents the weighted average rate for the U.S. qualified plans in 2021 due to the spin-off remeasurement.
Effect Of A 25 Basis Point Decrease On Net Pension Expense [Table Text Block]
The following illustrates the effect on pension expense for 2024 of a 25 basis point decrease in the above assumptions: 

In millions2024
Expense (Income):
Discount rate$12 
Expected long-term rate of return on plan assets21 
Projected Future Pension Benefit Payments, Excluding Any Termination Benefits [Table Text Block]
At December 31, 2023, projected future pension benefit payments, excluding any termination benefits, were as follows: 

In millions  
2024$620 
2025632 
2026639 
2027639 
2028639 
2029-20333,175