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Asset Impairment Expense (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Wind turbines and projects [Member]
Dec. 31, 2011
Wind turbines and projects [Member]
Dec. 31, 2010
Wind turbines and projects [Member]
Sep. 30, 2012
Wind Turbines [Member]
Sep. 30, 2012
Wind projects [Member]
Jun. 30, 2012
St Patrick [Member]
Dec. 31, 2012
St Patrick [Member]
Dec. 31, 2011
St Patrick [Member]
Dec. 31, 2010
St Patrick [Member]
Dec. 31, 2012
Kelanitissa [Member]
Dec. 31, 2011
Kelanitissa [Member]
Dec. 31, 2010
Kelanitissa [Member]
Dec. 31, 2012
Other Impairment [Member]
Dec. 31, 2011
Other Impairment [Member]
Dec. 31, 2010
Other Impairment [Member]
Dec. 31, 2012
Deepwater [Member]
Dec. 31, 2011
Deepwater [Member]
MW
Dec. 31, 2010
Deepwater [Member]
Dec. 31, 2012
Southland Huntington Beach [Member]
Dec. 31, 2011
Southland Huntington Beach [Member]
Dec. 31, 2010
Southland Huntington Beach [Member]
Asset Impairment Expense [Line Items]                                                
Asset Impairment Charges $ 73 $ 173 $ 304 $ 41 $ 116 $ 0 $ 20 $ 21 $ 11 $ 11 $ 0 $ 0 $ 19 $ 42 $ 0 $ 2 $ 15 $ 25 $ 0 $ 0 $ 79 $ 0 $ 0 $ 200
Fair Value of nonrecurring measurement 35           25 0 22       10                   88  
Carrying Amount             $ 45 $ 21 $ 33       $ 29                   $ 288  
Generation Capacity (MW)                                       160