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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.

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Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months Outstanding average forward exchange and purchase option contracts that mature within six months.

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Average Maturity of Foreign Exchange Hedging Contracts - within Three Months. Outstanding average forward exchange and purchase option contracts that mature within three months.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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