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FINANCIAL INSTRUMENTS - Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Net deferred tax liabilities $ 78  
Change in fair value of non-hedge derivatives 6 $ 12
Effective portion of change in fair value of hedging instruments (16) 16
Net deferred tax liabilities 32 78
Other current assets 2 1
Other long-term assets 1 1
Other current liabilities (30) (50)
Other long-term obligations (2) (28)
Cash flow hedge    
Disclosure of detailed information about financial instruments [line items]    
Net deferred tax liabilities (76) (263)
Derivative cash (inflow) outflow, operating activities 62 156
Effective portion of change in fair value of hedging instruments (19) 25
Amount of gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing) 5 0
Excluded from effectiveness changes (5) 0
Net deferred tax liabilities (29) (76)
Other current assets 2 1
Other long-term assets 1 1
Other current liabilities (30) (50)
Other long-term obligations (2) (28)
Assets (liabilities) (29) (76)
Non-hedging contracts    
Disclosure of detailed information about financial instruments [line items]    
Net deferred tax liabilities 7  
Change in fair value of non-hedge derivatives 11 12
Net deferred tax liabilities 7 7
Non-hedging contracts | Cash flow hedge    
Disclosure of detailed information about financial instruments [line items]    
Change in fair value of non-hedge derivatives $ 4 $ 6