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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, 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

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