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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Foreign Currency Exchange Contracts, Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Net change in fair value, gain (loss) $ 7,000,000 $ 4,000,000 $ 5,000,000 $ (1,000,000)  
Not Designated as Hedging Instrument | Foreign currency exchange contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Aggregate notional amounts 253,000,000   253,000,000    
Fair value, derivative liability 4,000,000   4,000,000   $ 8,000,000
Fair value, derivative, included in other current liabilities 4,000,000   4,000,000   11,000,000
Fair value, derivative, included in prepaid expenses and other current assets $ 0   0   $ 3,000,000
Loss related to settlements during period     $ 9,000,000 $ 4,000,000