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INCOME TAXES - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Expected Canadian statutory rate	26.90%	26.90%	26.90%
Loss before benefit from income taxes	$ (1,837)	$ (4,154)	$ (1,741)
Benefit from income taxes
Expected benefit from income taxes at Canadian statutory rate	494	1,117	468
Non-deductible amount of share-based compensation	(7)	(10)	(37)
Adjustments to tax attributes	(99)	(4)	(242)
Impact of changes in enacted income tax rates	0	0	747
Change in valuation allowance related to foreign tax credits and NOLs	21	(3)	139
Change in valuation allowance on Canadian deferred tax assets and tax rate changes	(142)	(875)	(360)
Change in uncertain tax positions	(350)	(47)	(65)
Foreign tax rate differences	186	(3)	933
Non-deductible portion of Goodwill impairments	0	(488)	(139)
Tax differences on divestitures of businesses	0	0	203
Tax benefit on intra-entity transfers	0	356	2,480
Other	(49)	(33)	18
(Provision for) benefit from income taxes	$ 54	$ 10	$ 4,145

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Effective Income Tax Rate Reconciliation, Adjustments To Tax Attributes, Amount

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