Debt (Schedule of Long-term Debt) (Details) € in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)		Sep. 30, 2014 EUR (€)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Long-Term Debt
Subtotal		$ 2,542		$ 2,633
Unamortized debt issuance costs		(22)	[1]	(27)	[1]		$ (27)	$ (30)
Current installments of long-term debt		(56)		(25)
Total		2,468		2,586
Term C-2 Loan Facility [Member]
Debt Instrument [Line Items]
Secured Debt		$ 30		34		€ 28
Long-Term Debt
Credit facility, expiration date		Oct. 15, 2016
Term C-3 Loan Facility [Member]
Debt Instrument [Line Items]
Secured Debt		$ 878		906
Senior Unsecured Notes Due 2018 [Member]
Long-Term Debt
Maturity Date		Oct. 31, 2018
Interest Rate		6.625%
Senior Unsecured Notes Due 2019 [Member]
Long-Term Debt
Senior unsecured notes		$ 327		364
Maturity Date		Oct. 15, 2019
Interest Rate		3.25%
Senior Unsecured Notes Due 2021 [Member]
Long-Term Debt
Senior unsecured notes		$ 400		400
Maturity Date		Jun. 15, 2021
Interest Rate		5.875%
Senior Unsecured Notes Due 2022 [Member]
Long-Term Debt
Senior unsecured notes		$ 500		$ 500
Maturity Date		Nov. 15, 2022		Nov. 15, 2022
Interest Rate		4.625%
Pollution Control and Industrial Revenue Bonds [Member]
Long-Term Debt
Pollution control and industrial revenue bonds due at various dates through 2030, interest rates ranging from 5.7% to 6.7%		$ 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
Obligations under capital leases due at various dates through 2054		$ 238		260
Long-term Debt [Member]
Long-Term Debt
Unamortized debt issuance costs	[2]	$ (18)		$ (22)

[1] Includes $4 million and $5 million as of December 31, 2015 and 2014, respectively, related to the Company's revolving credit facility and accounts receivables securitization facility, which are included in Other noncurrent assets in the consolidated balance sheets.

[2] Related to the Company's outstanding senior credit facilities - Term C-2 and Term C-3 loans, senior unsecured notes issued in public offerings registered under the Securities Act of 1933 (collectively, the "Senior Notes") and pollution control bonds.