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Contingencies And Commitments (European Commission Matters) (Narrative) (Details) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended	1 Months Ended				1 Months Ended
	Jan. 31, 2007	Dec. 31, 2011	Jul. 31, 2006 Italian Government [Member]	Nov. 19, 2009 Italian Government [Member] USD ($)	Jan. 31, 2007 Tariffs Granted By Spain [Member] USD ($)	Jan. 31, 2007 Tariffs Granted By Spain [Member] EUR (€)	Jan. 31, 2007 Spanish Government [Member]
Loss Contingencies [Line Items]
Number of years operating under a power supply structure			10				9
Italian government extended tariff charge, minimum				$ 300
Italian government extended tariff charge, maximum				500
Charge related to EC announcement				250
Write-off of receivable				20
Days provided to submit observations and comments to the EC	30
Amount of curtailment, in kmt-per year		44
Current agreement expiration date		2012
Loss contingency, range of possible loss, maximum					$ 90	€ 70