(Reconciliation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings (loss) from continuing operations attributable to International Paper common shareholders	$ 557	$ 302	$ 1,741
Weighted average common shares outstanding	347.2	346.9	363.5
Effect of dilutive securities:	7.0	2.2	3.5
Weighted average common shares outstanding  – assuming dilution	354.2	349.1	367.0
Basic earnings (loss) per share from continuing operations	$ 1.60	$ 0.87	$ 4.79
Diluted earnings (loss) per share from continuing operations	$ 1.57	$ 0.86	$ 4.74