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FAIR VALUE MEASUREMENTS - Assets Measured on Non-Recurring Basis (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of fair value measurement of assets [line items] |  |
Total assets | $ 44,392 | $ 22,631
Property, plant and equipment | Non-recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 130 |
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 | 130 |
Impairment charges | $ 389 |

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