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INCOME TAXES - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Canadian statutory rate 26.90% 26.90% 26.90%
Income (loss) before income taxes $ 167 $ (390) $ (129)
Provision for income taxes      
Expected (provision for) benefit from income taxes at Canadian statutory rate (45) 105 35
Non-deductible amount of share-based compensation (19) (19) (19)
Adjustments to tax attributes (4) 32 53
Change in valuation allowance related to foreign tax credits and NOLs (21) (6) 100
Change in valuation allowance on Canadian deferred tax assets and tax rate changes (82) (158) 24
Change in uncertain tax positions (62) (28) (50)
Foreign tax rate differences (4) (42) (57)
Non-deductible portion of Goodwill impairments 0 (104) (175)
Other (2) (1) 6
Provision for income taxes $ (239) $ (221) $ (83)