General Information - Narrative (Details) - USD ($) shares in Millions		3 Months Ended		24 Months Ended
	Jan. 29, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 28, 2020	Jan. 01, 2018
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Distribution of membership interest		$ 397,300,000	$ 88,700,000	$ 247,900,000
Shares repurchased (in shares)	15.1			20.8
Cash paid for repurchase of common stock	$ 250,000,000
International Paper Company
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of days after exchange		180 days
Dollar limit per unit exchange (lesser of)		$ 250,000,000
Percentage limit per unit exchange (lesser of)		25.00%
International Paper Company
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
IP's ownership interest in GPIP	18.30%			21.60%	21.60%	20.50%