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IMPAIRMENT (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impairment charge |  |  |
Impairment loss | $ 66 | $ 192 | $ 245
Property and equipment |  |  |
Impairment charge |  |  |
Impairment loss | 15 | 100 | 150
Intangible assets |  |  |
Impairment charge |  |  |
Impairment loss |  | 14 |
Goodwill |  |  |
Impairment charge |  |  |
Impairment loss | $ 51 | $ 78 | $ 95

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