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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 $ (125) $ (142) $ (97)
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 (219) (148) (95)
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 63 3 3
Pension plan actuarial changes      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total income tax expense recognized directly in other comprehensive income $ 31 $ 3 $ (5)