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INCOME TAXES - Income Tax Recognized Directly in Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total income tax expense recognized directly in other comprehensive income $ (200) $ (75) $ (141)
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 (204) (90) (130)
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 8 8 (15)
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total income tax expense recognized directly in other comprehensive income $ (4) $ 7 $ 4