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Debt (Schedule of Long-term Debt) (Details) In Millions, unless otherwise specified			1 Months Ended	3 Months Ended				1 Months Ended	3 Months Ended			1 Months Ended	3 Months Ended				1 Months Ended	3 Months Ended			1 Months Ended	3 Months Ended			3 Months Ended		3 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 Term C-2 Loan Facility [Member]	Mar. 31, 2015 Term C-2 Loan Facility [Member] USD ($)	Mar. 31, 2014 Term C-2 Loan Facility [Member]	Dec. 31, 2014 Term C-2 Loan Facility [Member] USD ($)	Sep. 24, 2014 Term C-2 Loan Facility [Member] EUR (€)	Sep. 30, 2014 Term C-3 Loan Facility [Member]	Mar. 31, 2015 Term C-3 Loan Facility [Member] USD ($)	Mar. 31, 2014 Term C-3 Loan Facility [Member]	Dec. 31, 2014 Term C-3 Loan Facility [Member] USD ($)	Sep. 30, 2014 Senior Unsecured Notes Due 2019 [Member]	Mar. 31, 2015 Senior Unsecured Notes Due 2019 [Member] USD ($)	Mar. 31, 2014 Senior Unsecured Notes Due 2019 [Member]	Dec. 31, 2014 Senior Unsecured Notes Due 2019 [Member] USD ($)	Sep. 24, 2014 Senior Unsecured Notes Due 2019 [Member]	May 31, 2011 Senior Unsecured Notes Due 2021 [Member]	Mar. 31, 2015 Senior Unsecured Notes Due 2021 [Member] USD ($)	Mar. 31, 2014 Senior Unsecured Notes Due 2021 [Member]	Dec. 31, 2014 Senior Unsecured Notes Due 2021 [Member] USD ($)	Nov. 30, 2012 Senior Unsecured Notes Due 2022 [Member]	Mar. 31, 2015 Senior Unsecured Notes Due 2022 [Member] USD ($)	Mar. 31, 2014 Senior Unsecured Notes Due 2022 [Member]	Dec. 31, 2014 Senior Unsecured Notes Due 2022 [Member] USD ($)	Mar. 31, 2015 Pollution Control and Industrial Revenue Bonds [Member] USD ($)	Dec. 31, 2014 Pollution Control and Industrial Revenue Bonds [Member] USD ($)	Mar. 31, 2015 Obligations Under Capital Leases [Member] USD ($)	Dec. 31, 2014 Obligations Under Capital Leases [Member] USD ($)
Long-Term Debt
Senior credit facilities - Term loans				$ 30		$ 34	€ 28		$ 882		$ 906
Senior unsecured notes													323		364			400		400		500		500
Date of maturity												Oct. 15, 2019	Oct. 15, 2019	Oct. 15, 2019			Jun. 15, 2021	Jun. 15, 2021	Jun. 15, 2021		Nov. 15, 2022	Nov. 15, 2022	Nov. 15, 2022
Interest rate													3.25%		3.25%	3.25%	5.875%	5.875%		5.875%	4.625%	4.625%		4.625%
Credit facility, expiration date			Oct. 15, 2016	Oct. 15, 2016	Oct. 15, 2016			Oct. 15, 2018	Oct. 15, 2018	Oct. 15, 2018
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		Mar. 31, 2054
Capital lease obligations																											257	260
Subtotal	2,561	2,633
Current installments of long-term debt	(25)	(25)
Total	$ 2,536	$ 2,608