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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Cross-currency Swaps, Effect of Hedging Instruments on Financial Instruments (Details) - Net Investment Hedging - Cross-currency swaps - Designated as Hedging Instrument - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in Other comprehensive loss $ 28 $ (54) $ 57 $ 1
Interest Expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain excluded from assessment of hedge effectiveness $ 6 $ 6 $ 17 $ 17