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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Cross-currency Swaps, Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Payments or receipts in settlement of cross-currency swaps $ 11,000,000 $ 11,000,000    
Net Investment Hedging | Cross-currency swaps | Designated as Hedging Instrument        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Aggregate notional amounts       $ 1,250,000,000
Fair value cross-currency swaps liability, net 41,000,000   $ 70,000,000  
Net Investment Hedging | Cross-currency swaps | Designated as Hedging Instrument | Other Noncurrent Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value cross-currency swaps liability 50,000,000   79,000,000  
Net Investment Hedging | Cross-currency swaps | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value cross-currency swaps asset $ 9,000,000   $ 9,000,000