Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)	$ (4)	$ (15)	$ (109)
Derivatives designated as hedging instruments: [Member] | Interest rate swaps [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)			(4)
Derivatives designated as hedging instruments: [Member] | Interest rate swaps [Member] | Interest expense, net [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)		(9)	(10)
Derivatives designated as hedging instruments: [Member] | Foreign currency contracts [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)			(9)
Derivatives designated as hedging instruments: [Member] | Foreign currency contracts [Member] | Selling, general and administrative [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)			(12)
Derivatives designated as hedging instruments: [Member] | Foreign exchange impact of cross currency swaps [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)			(15)
Derivatives designated as hedging instruments: [Member] | Foreign exchange impact of cross currency swaps [Member] | Selling, general and administrative [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)			(15)
Derivatives not designated as hedging instruments: [Member] | Interest rate swaps [Member] | Interest expense, net [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)	(4)	(4)	(22)
Derivatives not designated as hedging instruments: [Member] | Foreign currency contracts [Member] | Selling, general and administrative [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)		(16)	(50)
Derivatives not designated as hedging instruments: [Member] | Foreign exchange impact of cross currency swaps [Member] | Selling, general and administrative [Member]
Schedule of impact that changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)		$ 14