EARNINGS PER SHARE ATTRIBUTABLE TO INTERNATIONAL PAPER COMPANY COMMON SHAREHOLDERS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings (loss) from continuing operations attributable to International Paper Company common shareholders	$ 511	$ 308		$ 871	$ 575
Weighted average common shares outstanding	367.6	391.5		371.4	392.1
Restricted performance share plan	3.1	5.3		4.3	5.6
Weighted average common shares outstanding – assuming dilution	370.7	396.8		375.7	397.7
Basic earnings (loss) per share from continuing operations	$ 1.39	$ 0.79		$ 2.34	$ 1.47
Diluted earnings (loss) per share from continuing operations	$ 1.38	$ 0.78		$ 2.32	$ 1.45
Restructuring and other charges, net	$ 0	$ 174		$ 0	$ 204
Early Debt Extinguishment Costs [Member] | Corporate and Other [Member]
Restructuring and other charges, net		$ 170	$ 18	$ 0