Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income (loss)	$ 864	$ 204	$ 1,647	$ 329
Change in cumulative foreign currency translation adjustment	(70)	(28)	99	(515)
Net gains (losses) arising during the period	(4)	(4)	3	(34)
Reclassification adjustment for (gains) losses included in net earnings (loss)	(8)	6	(9)	26
Total Other Comprehensive Income (Loss), Net of Tax	780	17	1,026	(395)
Comprehensive Income (Loss)	1,644	221	2,673	(66)
Less: Net earnings (loss) attributable to noncontrolling interests	0	0	(2)	0
Other comprehensive (income) loss attributable to noncontrolling interests	0	0	2	2
Comprehensive Income (Loss) Attributable to International Paper Company	1,644	221	2,673	(64)
U.S. plans
Amortization of pension and post-retirement prior service costs and net loss:	31	42	101	127
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	826	0	826	0
Foreign Plan
Amortization of pension and post-retirement prior service costs and net loss:	0	1	0	1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	$ 5	$ 0	$ 6	$ 0