Financial Instruments - Summary of Derivative Instruments Fair Value (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current assets	$ 6	$ 11
Other current liabilities	(70)	(82)
Net Designated (Liability) Asset	(64)	(71)
Derivatives Designated as Hedging Instruments [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Designated (Liability) Asset	(50)	(48)
Derivatives Not Designated as Hedging Instruments [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Designated (Liability) Asset	(14)	(23)
Foreign exchange contracts - forwards [Member] | Derivatives Designated as Hedging Instruments [Member] | Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current assets	1	3
Foreign exchange contracts - forwards [Member] | Derivatives Designated as Hedging Instruments [Member] | Other current liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current liabilities	(51)	(51)
Foreign exchange contracts - forwards [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current assets	5	8
Foreign exchange contracts - forwards [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other current liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current liabilities	$ (19)	$ (31)