Derivatives and Hedging Activities Derivatives and Hedging Activities (Gains And Losses Recognized In Consoldiated Statement Of Operations On Qualifying And Non-Qualifying Financial Instruments (Parenthetical) (Details) (Restructuring And Other Charges [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Restructuring And Other Charges [Member]
Derivative [Line Items]
Derivative, cost of hedge	$ 5