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Debt (Schedule of Long-term Debt) (Details) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 EUR (€)
Long-Term Debt
Subtotal	$ 2,567	$ 2,633
Current installments of long-term debt	(26)	(25)
Total	2,541	2,608
Term C-2 Loan Facility [Member]
Long-Term Debt
Senior credit facilities - Term loans	$ 31	34	€ 28
Credit facility, expiration date	Oct. 15, 2016
Term C-3 Loan Facility [Member]
Long-Term Debt
Senior credit facilities - Term loans	$ 884	906
Credit facility, expiration date	Oct. 15, 2018
Senior Unsecured Notes Due 2019 [Member]
Long-Term Debt
Senior unsecured notes	$ 336	364
Date of maturity	Oct. 15, 2019
Interest rate	3.25%
Senior Unsecured Notes Due 2021 [Member]
Long-Term Debt
Senior unsecured notes	$ 400	400
Date of maturity	Jun. 15, 2021
Interest rate	5.875%
Senior Unsecured Notes Due 2022 [Member]
Long-Term Debt
Senior unsecured notes	$ 500	500
Date of maturity	Nov. 15, 2022
Interest rate	4.625%
Pollution Control and Industrial Revenue Bonds [Member]
Long-Term Debt
Other long-term debt	$ 169	169
Interest rate, stated percentage range, minimum	5.70%
Interest rate, stated percentage range, maximum	6.70%
Year of maturity, range end	Dec. 31, 2030
Obligations Under Capital Leases [Member]
Long-Term Debt
Year of maturity, range end	Dec. 31, 2054
Capital lease obligations	$ 247	$ 260