Financial Instruments - Summary of Derivative Instruments Gain (Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 37	$ 37	$ (26)
Currency Losses Net	7	(3)	(12)
Interest rate contracts [Member] | Fair Value Hedging [Member] | Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in Income	0	0	15
Hedged Item Gain (Loss) Recognized in Income	0	0	(15)
Foreign exchange contracts - forwards [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in OCI	(126)	(50)	30
Foreign exchange contracts - forwards [Member] | Cash Flow Hedging [Member] | Cost of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI to Income	(123)	37	14
Foreign exchange contracts - forwards [Member] | Not Designated as Hedging Instrument [Member] | Other expense - Currency gains (losses), net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in Income	$ (86)	$ (38)	$ 33