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FAIR VALUE MEASUREMENTS - Assets Measured on Non-Recurring Basis (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of fair value measurement of assets [line items] |  |
Total assets | $ 25,308 | $ 25,264
Impairment reversals | 254 |
Other assets | Non-recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 45 |
Impairment loss | 30 |
Other assets | Non-recurring fair value measurement | Quoted prices in active markets for identical assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Other assets | Non-recurring fair value measurement | Significant other observable inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Other assets | Non-recurring fair value measurement | Significant unobservable inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 45 |
Property, plant and equipment | Non-recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 6,105 |
Property, plant and equipment | Non-recurring fair value measurement | Quoted prices in active markets for identical assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Property, plant and equipment | Non-recurring fair value measurement | Significant other observable inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Property, plant and equipment | Non-recurring fair value measurement | Significant unobservable inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 6,105 |
Intangible assets | Non-recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 34 |
Impairment loss | 12 |
Intangible assets | Non-recurring fair value measurement | Quoted prices in active markets for identical assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Intangible assets | Non-recurring fair value measurement | Significant other observable inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Intangible assets | Non-recurring fair value measurement | Significant unobservable inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | $ 34 |

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