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FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Recurring fair value measurement          
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]          
Financial assets $ 56   $ 56   $ 29
Financial liabilities (current and non-current) 66   66   77
Cash flow hedges | Financial assets at fair value through other comprehensive income, category          
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]          
Gains (losses) on hedging instrument, fair value hedges 0 $ 6 9 $ 5  
Derivative financial assets $ 56   $ 56   $ 29