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Contingencies And Commitments (European Commission Matters) (Narrative) (Details)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended
Jan. 31, 2007
D
Mar. 31, 2012
Jul. 31, 2006
Italian Government [Member]
Y
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]
Nov. 19, 2009
Maximum [Member]
Italian Government [Member]
USD ($)
Nov. 19, 2009
Minimum [Member]
Italian Government [Member]
USD ($)
Loss Contingencies [Line Items]                  
Number of years operating under a power supply structure     10       9    
Italian Government extended tariff charge               $ 500 $ 300
Charge related to European commission 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   44,000              
Current agreement expiration date   2012              
Loss contingency, range of possible loss, maximum         $ 90 € 70