Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of the fair value of the Company's derivative contracts
Fair Value Asset	$ 8	$ 2
Fair Value Liability	(30)	(39)
Interest rate swaps [Member] | Other current assets [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Asset	0
Interest rate swaps [Member] | Other non-current assets [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Asset	0
Interest rate swaps [Member] | Accrued expenses and other current liabilities [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Liability	(4)	(4)
Interest rate swaps [Member] | Other non-current liabilities [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Liability	(1)	(2)
Foreign currency forward contracts [Member] | Other current assets [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Asset	8	2
Foreign currency forward contracts [Member] | Accrued expenses and other current liabilities [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Liability	$ (25)	$ (33)