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				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Net Effect of Exchange Rate Fluctuations	Sep. 30, 2013 Net Effect of Exchange Rate Fluctuations	Sep. 30, 2014 Net Effect of Exchange Rate Fluctuations	Sep. 30, 2013 Net Effect of Exchange Rate Fluctuations	Sep. 30, 2014 Change in Certain Derivative Instruments	Sep. 30, 2014 Change in Certain Derivative Instruments	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, 2014 Employee Benefit Plans	Sep. 30, 2013 Employee Benefit Plans	Sep. 30, 2014 Employee Benefit Plans	Sep. 30, 2013 Employee Benefit Plans	Sep. 30, 2014 Accumulated Other Comprehensive Loss	Sep. 30, 2013 Accumulated Other Comprehensive Loss	Sep. 30, 2014 Accumulated Other Comprehensive Loss	Sep. 30, 2013 Accumulated Other Comprehensive Loss
Increase (Decrease) Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance at beginning of the period					$ 311	$ 267	$ 229	$ 455	$ (5)	$ (5)	$ (7)	$ (7)	$ (7)	$ (1,267)	$ (1,778)	$ (1,304)	$ (1,913)	$ (961)	$ (1,518)	$ (1,080)	$ (1,465)
Change before reclassifications					(216)	21	(134)	(167)	1	3							55	(215)	21	(131)	(112)
Amounts reclassified from accumulated other comprehensive income										(2)				19	34	64	103	19	34	62	103
Translation effect														22	(14)	16	1	22	(14)	16	1
Tax effect														9	(2)	7	(6)	9	(2)	7	(6)
Other comprehensive income attributable to the Company	(168)	39	(50)	(20)	(216)	21	(134)	(167)	1	1				50	18	87	153	(165)	39	(46)	(14)
Balance at end of the period					$ 95	$ 288	$ 95	$ 288	$ (4)	$ (4)	$ (7)	$ (7)	$ (7)	$ (1,217)	$ (1,760)	$ (1,217)	$ (1,760)	$ (1,126)	$ (1,479)	$ (1,126)	$ (1,479)