INDUSTRY SEGMENT INFORMATION Operating Profit by Industry Segment Footnotes (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended		12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net bargain purchase gain on acquisition of business		$ 0			$ 0		$ (6)	$ 0
Inventory write-up							14
Impairment of Long-Lived Assets to be Disposed of		9			28		9	65
Interest Income, Income tax settlement		4					4
Restructuring and other charges		$ (16)	$ 0		0	$ 1	(16)	1
Percent of capacity		100.00%
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements					439			439
Other
Segment Reporting Information [Line Items]
Restructuring and other charges		$ (2)
Riegelwood mill conversion costs
Segment Reporting Information [Line Items]
Restructuring and other charges						9		9
Asia Foodservice
Segment Reporting Information [Line Items]
Impairment of Long-Lived Assets to be Disposed of		9					9
IP Asia Packaging
Segment Reporting Information [Line Items]
Impairment of Long-Lived Assets to be Disposed of					28	$ 41		65
Holmen Paper Newsprint Mill
Segment Reporting Information [Line Items]
Net bargain purchase gain on acquisition of business			$ (6)				6
Weyerhaeuser Pulp Business
Segment Reporting Information [Line Items]
Integration costs		5			$ 5		9	$ 5
Inventory write-up				$ 14					$ 33
Kleen Products Llc Versus Packaging Corp Of America
Segment Reporting Information [Line Items]
Payments for Legal Settlements	$ 354	354					354
Printing Papers | Other
Segment Reporting Information [Line Items]
Restructuring Costs and Asset Impairment Charges		2					2
Industrial Packaging | Other
Segment Reporting Information [Line Items]
Restructuring Costs and Asset Impairment Charges		$ 3					4
Global Cellulose Fibers | Other
Segment Reporting Information [Line Items]
Restructuring Costs and Asset Impairment Charges							$ 1