Debt (Schedule of Long-term Debt) (Details) (USD $) In Millions, unless otherwise specified			1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended			3 Months Ended		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2010 Term C Loan Facility [Member]	Mar. 31, 2014 Term C Loan Facility [Member]	Dec. 31, 2013 Term C Loan Facility [Member]	Sep. 30, 2013 Term C-2 Loan Facility [Member]	Mar. 31, 2014 Term C-2 Loan Facility [Member]	Dec. 31, 2013 Term C-2 Loan Facility [Member]	Sep. 30, 2010 Senior Unsecured Notes Due 2018 [Member]	Mar. 31, 2014 Senior Unsecured Notes Due 2018 [Member]	Dec. 31, 2013 Senior Unsecured Notes Due 2018 [Member]	May 31, 2011 Senior Unsecured Notes Due 2021 [Member]	Mar. 31, 2014 Senior Unsecured Notes Due 2021 [Member]	Dec. 31, 2013 Senior Unsecured Notes Due 2021 [Member]	Nov. 30, 2012 Senior Unsecured Notes Due 2022 [Member]	Mar. 31, 2014 Senior Unsecured Notes Due 2022 [Member]	Dec. 31, 2013 Senior Unsecured Notes Due 2022 [Member]	Apr. 30, 2013 Credit-Linked Revolving Facility [Member]	Mar. 31, 2014 Credit-Linked Revolving Facility [Member]	Aug. 31, 2013 Accounts Receivable Securitization Facility [Member]	Mar. 31, 2014 Accounts Receivable Securitization Facility [Member]	Dec. 31, 2013 Accounts Receivable Securitization Facility [Member]	Mar. 31, 2014 Pollution Control and Industrial Revenue Bonds [Member]	Dec. 31, 2013 Pollution Control and Industrial Revenue Bonds [Member]	Mar. 31, 2014 Obligations Under Capital Leases [Member]	Dec. 31, 2013 Obligations Under Capital Leases [Member]
Long-Term Debt
Credit facility							$ 975	$ 978													$ 35
Senior unsecured notes										600	600		400	400		500	500
Year of maturity									Oct. 15, 2018	Oct. 15, 2018	Oct. 15, 2018	Jun. 15, 2021	Jun. 15, 2021	Jun. 15, 2021	Nov. 15, 2022	Nov. 15, 2022	Nov. 15, 2022
Interest rate, stated percentage									6.625%	6.625%	6.625%	5.875%	5.875%	5.875%	4.625%	4.625%	4.625%
Credit facility, expiration date			Oct. 31, 2016	Oct. 31, 2016	Oct. 31, 2016	Oct. 31, 2016	Oct. 31, 2016											Mar. 28, 2014	Mar. 28, 2014	Aug. 28, 2016
Credit facility, interest rate																			1.70%		0.70%	0.70%
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																									260	264
Subtotal	2,904	2,911
Current installments of long-term debt	(23)	(24)
Total	$ 2,881	$ 2,887