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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Financing Arrangements and Derivative Financial Instruments - Fair Values for Foreign Currency Contracts (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures
Foreign currency derivatives, notional amount	$ 1,625		$ 1,240
Foreign currency derivatives, net transaction gains (losses)	15	$ 2
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures
Foreign currency derivatives, notional amount	344		347
Accounts receivable
Derivative Instruments and Hedging Activities Disclosures
Fair value - asset, not designated as hedging instruments	21		7
Fair value - asset, designated as hedging instruments	11		9
Other current liabilities
Derivative Instruments and Hedging Activities Disclosures
Fair value - liability, not designated as hedging instruments	(2)		(6)
Fair value - liability, designated as hedging instruments	(1)		(1)
Other assets
Derivative Instruments and Hedging Activities Disclosures
Fair value - asset, designated as hedging instruments	3		2
Other long term liabilities
Derivative Instruments and Hedging Activities Disclosures
Fair value - liability, designated as hedging instruments	$ 0		$ 0