Financial Instruments and Fair Value Measurements Additional Disclosures (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Interest rate swaps [Member]
Derivatives [Line Items]
Notional amount of derivative	$ 600,000,000		$ 600,000,000
Gain (loss) on designated interest rate swaps	3,000,000	$ 0	5,000,000	$ 0
Foreign exchange contract [Member]
Derivatives [Line Items]
Notional amount of derivative	296,000,000		296,000,000		$ 152,000,000
Gain (loss) on designated foreign exchange contract recognized in OCI			(1,000,000)	(1,000,000)
Gain (loss) on designated foreign exchange contract reclassified from accumulated OCI			(2,000,000)	(1,000,000)
Gain (loss) on non-designated foreign exchange contract	$ (7,000,000)	$ (2,000,000)	$ 6,000,000	$ (2,000,000)
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Stated interest rate	2.30%		2.30%
Face value of debt	$ 600,000,000		$ 600,000,000