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Debt (Schedule of Long-term Debt) (Details) € in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Sep. 30, 2014 EUR (€)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Long-Term Debt
Subtotal		$ 2,578	$ 2,633
Current installments of long-term debt		(26)	(25)
Total		2,552	2,608
Term C-2 Loan Facility [Member]
Long-Term Debt
Senior credit facilities - Term loans	€ 28	$ 31	34
Credit facility, expiration date	Oct. 15, 2016	Oct. 15, 2016
Term C-3 Loan Facility [Member]
Long-Term Debt
Senior credit facilities - Term loans		$ 886	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		Nov. 01, 2030
Obligations Under Capital Leases [Member]
Long-Term Debt
Year of maturity, range end		Mar. 31, 2054
Capital lease obligations		$ 256	$ 260