Derivative Instruments and Hedging Activities Level 4 (Details) - Summary of Financial Instruments (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Fair Value Liability of Cash Flow Hedging Instruments - Interest swap - 2010	$ 0	$ 0
Fair Value Liability of Commodity Contracts Not Designated as Hedging Instruments	0	(1)
Electricity contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	2	3
Fair Value Liability of Commodity Contracts Not Designated as Hedging Instruments	0	(1)
Natural gas futures [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	2	3
Fair Value Liability of Commodity Contracts Not Designated as Hedging Instruments	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Maturity Date	Jan. 02, 2013
Derivative Liability, Notional Amount	0	325
Derivative, Fixed Interest Rate	1.032%
Fair Value Liability of Cash Flow Hedging Instruments - Interest swap - 2010	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Maturity Date	Dec. 05, 2014
Derivative Liability, Notional Amount	6	6
Derivative, Fixed Interest Rate	4.14%
Fair Value Liability of Derivative Instruments Not Designated as Hedging Instruments - Australian dollar interest swap	$ 0	$ 0