EARNINGS PER SHARE CALCULATIONS - Summary of Net Income for EPS Calculations, Basic (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
(Loss) income from continuing operations, net of tax		$ (72)	$ 372	$ (3,153)	$ (805)
Net income from continuing operations attributable to noncontrolling interests		7	5	20	18
Net income from continuing operations attributable to participating securities	[1]	0	0	0	(1)
(Loss) income from continuing operations attributable to common stockholders		(79)	367	(3,173)	(824)
Income from discontinued operations, net of tax		0	5	0	1,217
Net income from discontinued operations attributable to noncontrolling interests		0	0	0	(72)
Income from discontinued operations attributable to common stockholders		0	5	0	1,145
Net (loss) income attributable to common stockholders		$ (79)	$ 372	$ (3,173)	$ 321

[1] Historical Dow restricted stock units are considered participating securities due to Historical Dow's practice of paying dividend equivalents on unvested shares.