INCOME TAXES - Components of (Recovery of) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of loss before recovery of income taxes
Domestic	$ (1,804)	$ (1,516)	$ (851)
Foreign	(631)	1,361	1,905
(Loss) income before (recovery of) provision for income taxes	(2,435)	(155)	1,054
Current:
Domestic	0	0	1
Foreign	241	77	150
Total	241	77	151
Deferred:
Domestic	0	(3)	0
Foreign	(268)	59	23
Total	(268)	56	23
Provision for (recovery of) income taxes	$ (27)	$ 133	$ 174