Financial Instruments and Fair Value Measurements Additional Disclosures (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 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	2,000,000	$ 1,000,000	7,000,000	$ 1,000,000
Foreign exchange contract [Member]
Derivatives [Line Items]
Notional amount of derivative	321,000,000		321,000,000		$ 152,000,000
Gain (loss) on designated foreign exchange contract recognized in OCI	0	0	(1,000,000)	(1,000,000)
Gain (loss) on designated foreign exchange contract reclassified from accumulated OCI	0	(1,000,000)	(2,000,000)	(2,000,000)
Gain (loss) on non-designated foreign exchange contract	$ 10,000,000	$ 5,000,000	$ 16,000,000	$ 3,000,000
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Stated interest rate	2.30%		2.30%
Face value of senior debt	$ 600,000,000		$ 600,000,000