EQUITY METHOD INVESTMENTS Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Proceeds from sales of equity method investments				$ 250	$ 0
Equity earnings (loss), net of taxes	$ 72		$ 80	41	194
Equity method dividends received				$ 151	251
Reportable Subsegments | Graphic Packaging LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest	18.90%			18.90%		20.50%
Proceeds from sales of equity method investments		$ 250
Gain (Loss) on Sale of Equity Investments		33
Gain (loss) on sale of equity method investment, net of tax		$ 25
Equity earnings (loss), net of taxes	$ 11		14	$ 18	27
Equity method investments	929			929			$ 1,100
Equity method investment, difference between carrying amount and underlying equity	460			460			529
Revenue from related parties	$ 60		74	130	143
Equity method dividends received				$ 10	12
Equity method investments, aggregate units exchanged		15,150,784				79,911,511
Reportable Subsegments | Ilim Holding
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest	50.00%			50.00%
Equity earnings (loss), net of taxes	$ 63		67	$ 28	168
Equity method investments	386			386			508
Equity method investment, difference between carrying amount and underlying equity	131			131			$ 136
Related party transaction, purchases from related party	$ 39		$ 59	90	112
Equity method dividends received				$ 141	$ 239