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INCOME TAXES - Schedule of Effective Income Tax Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Canadian statutory rate 26.90% 26.90% 26.90%
Loss before income taxes $ (390) $ (129) $ (1,024)
(Provision for) benefit from income taxes      
Expected benefit from income taxes at Canadian statutory rate 105 35 275
Non-deductible amount of share-based compensation (19) (19) (9)
Adjustments to tax attributes 32 53 (59)
Change in valuation allowance related to foreign tax credits and NOLs (6) 100 28
Change in valuation allowance on Canadian deferred tax assets and tax rate changes (158) 24 40
Change in uncertain tax positions (28) (50) 112
Foreign tax rate differences (42) (57) (198)
Non-deductible portion of Goodwill impairments (104) (175) (99)
Other (1) 6 (3)
(Provision for) benefit from income taxes $ (221) $ (83) $ 87