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Financial Instruments - Foreign Exchange Risk Management (Details) - Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gross Notional Value $ 164 $ 167
Average Maturity of Foreign Exchange Hedging Contracts - within Three Months 65.00%  
Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months 14.00%  
Average Maturity of Foreign Exchange Hedging Contracts - within Six and Twelve Months 16.00%  
Average Maturity of Foreign Exchange Hedging Contracts - greater than twelve months 5.00%