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Financial Instruments - Foreign Exchange Risk Management (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Philippine Peso U.S. Dollar [Member]    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Gross Notional Value $ 53 $ 62
Indian Rupee U S Dollar Member    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Gross Notional Value 69 68
Mexican Peso U. S. Dollar [Member]    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Gross Notional Value 8 9
All Other Currency [Member]    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Gross Notional Value $ 37 21
Designated as Hedging Instrument [Member]    
Foreign Exchange Contracts [Line Items]    
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 17.00%  
Average Maturity of Foreign Exchange Hedging Contracts - greater than twelve months 4.00%  
Summary of Foreign Exchange Hedging Positions [Abstract]    
Gross Notional Value $ 167 160
Foreign exchange contract [Member]    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Fair Value Asset (Liability) [1] 2 1
Foreign exchange contract [Member] | Philippine Peso U.S. Dollar [Member]    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Fair Value Asset (Liability) [1] 0 0
Foreign exchange contract [Member] | Indian Rupee U S Dollar Member    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Fair Value Asset (Liability) [1] 2 1
Foreign exchange contract [Member] | Mexican Peso U. S. Dollar [Member]    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Fair Value Asset (Liability) [1] 0 0
Foreign exchange contract [Member] | All Other Currency [Member]    
Summary of Foreign Exchange Hedging Positions [Abstract]    
Fair Value Asset (Liability) [1] $ 0 $ 0
[1] Represents the net receivable (payable) amount included in the Consolidated Balance Sheet.