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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
PROPERTY AND EQUIPMENT        
Costs of acquired assets $ 333 $ 296 $ 647 $ 514
Net book value of assets disposed 20 12 44 23
Net loss on disposal of assets $ 20 $ 2 $ 37 $ 9