EARNINGS PER SHARE - Schedule of Earnings per Share (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income (Numerator)
Net income	$ 273	$ 43	$ 424	$ 66
Net income attributable to the redeemable noncontrolling interests	(12)	0	(32)	0
Net income attributable to the noncontrolling interests	(9)	(1)	(17)	(2)
Numerator for basic and diluted earnings per common share available to common shareholders	$ 252	$ 42	$ 375	$ 64
Shares (Denominator)
Weighted average common shares outstanding (shares)	80,425	91,764	85,517	92,032
Dilutive effect of stock-settled appreciation rights and outstanding stock options (shares)	312	1,399	464	1,157
Weighted average common and common equivalent shares outstanding (shares)	80,737	93,163	85,981	93,189