INCOME TAXES - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Canadian statutory rate	26.90%	26.90%	26.90%
Loss before income taxes	$ (129)	$ (1,024)	$ (934)
(Provision for) benefit from income taxes
Expected benefit from income taxes at Canadian statutory rate	35	275	251
Non-deductible amount of share-based compensation	(19)	(9)	(9)
Adjustments to tax attributes	53	(59)	26
Change in valuation allowance related to foreign tax credits and NOLs	100	28	62
Change in valuation allowance on Canadian deferred tax assets and tax rate changes	24	40	687
Change in uncertain tax positions	(50)	112	(163)
Foreign tax rate differences	(57)	(198)	(128)
Non-deductible portion of Goodwill impairments	(175)	(99)	0
Tax benefit on intra-entity transfers	0	0	(338)
Other	6	(3)	(13)
(Provision for) benefit from income taxes	$ (83)	$ 87	$ 375