(Reconciliation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings (loss) from continuing operations attributable to International Paper common shareholders	$ 302	$ 1,741	$ 811
Weighted average common shares outstanding	346.9	363.5	389.4
Effect of dilutive securities:	2.2	3.5	3.0
Weighted average common shares outstanding  – assuming dilution	349.1	367.0	392.4
Basic earnings (loss) per share from continuing operations	$ 0.87	$ 4.79	$ 2.08
Diluted earnings (loss) per share from continuing operations	$ 0.86	$ 4.74	$ 2.07