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Financial Instruments - Foreign Exchange Risk Management (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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.

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