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INCOME TAXES - Income Tax Recognized Directly in Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total income tax expense recognized directly in other comprehensive income $ (97) $ (200) $ (75)
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 (95) (204) (90)
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 3 8 8
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total income tax expense recognized directly in other comprehensive income $ (5) $ (4) $ 7