EARNINGS PER SHARE - Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic EPS calculation
Net income (loss)	$ 279	$ (3,554)	$ (1,434)	[1]
Net loss allocated to participating securities	(6)
Net income (loss) available to common stockholders	$ 273	$ (3,554)	$ (1,434)
Weighed-average common shares outstanding - basic	40.4	38.3	38.2
Basic EPS (in dollars per share)	$ 6.76	$ (92.79)	$ (37.54)
Diluted EPS calculation
Net income (loss)	$ 279	$ (3,554)	$ (1,434)	[1]
Net loss allocated to participating securities	(6)
Net income (loss) available to common stockholders	$ 273	$ (3,554)	$ (1,434)
Weighed-average common shares outstanding - basic	40.4	38.3	38.2
Weighted-average common shares outstanding - diluted	40.4	38.3	38.2
Diluted EPS (in dollars per share)	$ 6.76	$ (92.79)	$ (37.54)

[1] Net income of $683 million related to operations from January 1, 2014 through the spin-off date of November 30, 2014 was included in Net Parent Company Investment. The net loss of $2,117 million for the month ended December 31, 2014 reflected our accumulated deficit as of that date as a stand-alone company.