Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2013 Net Effect of Exchange Rate Fluctuations	Sep. 30, 2013 Net Effect of Exchange Rate Fluctuations	Sep. 30, 2013 Change in Certain Derivative Instruments	Jun. 30, 2013 Change in Certain Derivative Instruments	Dec. 31, 2012 Change in Certain Derivative Instruments	Sep. 30, 2013 Employee Benefit Plans	Sep. 30, 2013 Employee Benefit Plans	Sep. 30, 2013 Accumulated Other Comprehensive Loss	Sep. 30, 2013 Accumulated Other Comprehensive Loss
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance at beginning of the period	$ (1,520)	$ (1,506)	$ (1,270)	$ 267	$ 455	$ (14)	$ (14)	$ (14)	$ (1,812)	$ (1,947)	$ (1,559)	$ (1,506)
Change before reclassifications				21	(167)					55	21	(112)
Amounts reclassified from accumulated other comprehensive income									34	103	34	103
Translation effect									(14)	1	(14)	1
Tax effect									(2)	(6)	(2)	(6)
Other comprehensive income attributable to the Company				21	(167)				18	153	39	(14)
Balance at end of the period	$ (1,520)	$ (1,506)	$ (1,270)	$ 288	$ 288	$ (14)	$ (14)	$ (14)	$ (1,794)	$ (1,794)	$ (1,520)	$ (1,520)