EARNINGS PER SHARE - Schedule of Earnings per Share (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income (Numerator)
Net (loss) income	$ (3,367)	$ (49)	$ (2,943)	$ 18
Net income attributable to the redeemable noncontrolling interests	(19)	(11)	(51)	(11)
Net loss (income) attributable to the noncontrolling interests	130	0	113	(3)
Numerator for basic and diluted earnings per common share available to common shareholders	$ (3,256)	$ (60)	$ (2,881)	$ 4
Shares (Denominator)
Basic weighted average common shares outstanding (shares)	74,810	92,086	81,922	92,050
Dilutive effect of stock-settled appreciation rights and outstanding stock options (shares)	0	0	0	1,221
Diluted weighted average common and common equivalent shares outstanding (shares)	74,810	92,086	81,922	93,271