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INCOME TAXES - Income Tax Recognized Directly in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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