Financial Instruments, Summary of Derivative Instruments Fair Value (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Derivative Asset (Liability)	$ 26	$ (31)
Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Total Derivative Assets	57	27
Liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Total Derivative Liabilities	(31)	(58)
Derivatives Designated as Hedging Instruments [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Derivative Asset (Liability)	(2)	(30)
Derivatives Designated as Hedging Instruments [Member] | Assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Derivative Asset (Liability)	7
Derivatives Designated as Hedging Instruments [Member] | Liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Derivative Asset (Liability)		(25)
Derivatives Designated as Hedging Instruments [Member] | Foreign exchange contracts - forwards [Member] | Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Total Derivative Assets	16	7
Derivatives Designated as Hedging Instruments [Member] | Foreign exchange contracts - forwards [Member] | Other current liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Total Derivative Liabilities	(23)	(39)
Derivatives Designated as Hedging Instruments [Member] | Foreign currency options [Member] | Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Total Derivative Assets	5	2
Derivatives Designated as Hedging Instruments [Member] | Interest rate swap [Member] | Other Noncurrent Assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Total Derivative Assets	9	5
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts - forwards [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Derivative Asset (Liability)	19	(6)
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts - forwards [Member] | Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Total Derivative Assets	27	13
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts - forwards [Member] | Other current liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Total Derivative Liabilities	$ (8)	$ (19)