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FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Recurring fair value measurement          
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]          
Financial assets $ 24   $ 24   $ 27
Financial liabilities (current and non-current) 0   0   69
Cash flow hedges | Financial assets at fair value through other comprehensive income, category [member]          
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]          
Derivative financial assets 24   24   $ 27
Gains (losses) on hedging instrument, fair value hedges $ 0 $ 0 $ 0 $ 9