(Reconciliation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings (loss) from continuing operations attributable to International Paper common shareholders									$ 1,741	$ 811	$ 182
Weighted average common shares outstanding									363.5	389.4	393.0
Effect of dilutive securities:									3.5	3.0	2.7
Weighted average common shares outstanding  – assuming dilution									367.0	392.4	395.7
Basic earnings (loss) per share from continuing operations	$ 0.48	$ 2.48	$ 1.13	$ 0.71	$ 0.13	$ 0.86	$ 0.53	$ 0.56	$ 4.79	$ 2.08	$ 0.46
Diluted earnings (loss) per share from continuing operations	$ 0.48	$ 2.46	$ 1.13	$ 0.70	$ 0.13	$ 0.86	$ 0.52	$ 0.55	$ 4.74	$ 2.07	$ 0.46