Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of the fair value of the Company's derivative contracts
Fair Value Asset	$ 15	$ 2
Derivative liabilities, Fair Value	(4)	(39)
Interest rate swaps [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Asset
Interest rate swaps [Member] | Other current assets [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Asset
Interest rate swaps [Member] | Accrued expenses and other current liabilities [Member]
Summary of the fair value of the Company's derivative contracts
Derivative liabilities, Fair Value	(3)	(4)
Interest rate swaps [Member] | Other non-current liabilities [Member]
Summary of the fair value of the Company's derivative contracts
Derivative liabilities, Fair Value		(2)
Foreign currency contracts [Member] | Other current assets [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Asset	10	2
Foreign currency contracts [Member] | Other non-current assets [Member]
Summary of the fair value of the Company's derivative contracts
Fair Value Asset	5
Foreign currency contracts [Member] | Accrued expenses and other current liabilities [Member]
Summary of the fair value of the Company's derivative contracts
Derivative liabilities, Fair Value	(1)	(33)
Foreign currency contracts [Member] | Other non-current liabilities [Member]
Summary of the fair value of the Company's derivative contracts
Derivative liabilities, Fair Value