EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (Numerator)
Net income	$ 88	$ (49)	$ 43	$ 23	$ 208	$ 65	$ 29	$ 44	$ 105	$ 346	$ 594
Net income attributable to the redeemable noncontrolling interests									(48)	0	0
Net income attributable to the noncontrolling interests									(10)	(5)	(18)
Numerator for diluted earnings available to common shareholders									$ 47	$ 341	$ 576
Shares (Denominator)
Weighted average common shares outstanding (in shares)									92,015	100,913	99,844
Dilutive effect of outstanding stock settled appreciation rights and stock options (in shares)									1,170	805	945
Weighted-average common and common equivalent shares outstanding (in shares)									93,185	101,718	100,789
Antidilutive Securities Excluded from Computation
Antidilutive dilutive securities excluded from calculation of diluted earnings per share (in shares)									238	1,325	450