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RELATED PARTIES - Compensation of key management personnel (Details) - Long term incentive plan - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure of transactions between related parties          
Total carrying value of obligation under Plan $ 13   $ 13   $ 58
Share based payment (expense) gain included in Selling, general and administrative expenses $ 5 $ 7 $ (42) $ 9