EARNINGS PER SHARE - Schedule of Earnings per Share (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income (Numerator)
Net (loss) income	$ (328)	$ 273	$ (302)	$ 424
Net income attributable to the redeemable noncontrolling interests	(5)	(12)	(9)	(32)
Net loss (income) attributable to the noncontrolling interests	1	(9)	(33)	(17)
Numerator for basic (loss) earnings per common share available to common shareholders	(332)	252	(344)	375
Numerator for diluted (loss) earnings per common share available to common shareholders	$ (332)	$ 252	$ (344)	$ 375
Shares (Denominator)
Basic weighted average common shares outstanding (in shares)	75,331	80,425	74,862	85,517
Dilutive effect of stock-settled appreciation rights and outstanding stock options (in shares)	0	312	0	464
Diluted weighted average common and common equivalent shares outstanding (in shares)	75,331	80,737	74,862	85,981