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Financial Instruments - Foreign Exchange Risk Management (Details) - Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative, Notional Amount $ 143 $ 180
Average Maturity of Foreign Exchange Hedging Contracts - within Three Months 71.00%  
Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months 11.00%  
Average Maturity of Foreign Exchange Hedging Contracts - within Six and Twelve Months 14.00%  
Average Maturity of Foreign Exchange Hedging Contracts - greater than twelve months 4.00%