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INCOME TAXES - Income Tax Recognized Directly in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total income tax expense recognized directly in other comprehensive income	$ 68	$ 60	$ 36
Revaluation of property, plant and equipment
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total income tax expense recognized directly in other comprehensive income	67	59	35
Cash flow hedges
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total income tax expense recognized directly in other comprehensive income	$ 1	$ 1	$ 1