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Fair Value (Nonrecurring Measurements) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement $ 35    
Asset Impairment Charges 73 173 304
Other non-operating expense 50 82 7
Goodwill impairment 1,817 17 21
Long Lived Assets Held And Used [Member] | Kelanitissa [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 10    
Asset Impairment Charges 19 42  
Long Lived Assets Held And Used [Member] | Kelanitissa [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   24  
Long Lived Assets Held And Used [Member] | Wind projects [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges 21    
Long Lived Assets Held And Used [Member] | Bohemia [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges   9  
Long Lived Assets Held And Used [Member] | Bohemia [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Long Lived Assets Held For Sale [Member] | Wind projects [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges   22  
Long Lived Assets Held For Sale [Member] | Wind projects [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Long Lived Assets Held For Sale [Member] | Wind Turbines [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 25    
Asset Impairment Charges 20 116  
Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Long Lived Assets Held For Sale [Member] | St Patrick [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges 11    
Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges   40  
Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Long Lived Assets Held For Sale [Member] | Eastern Energy Subsidiary [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges   0  
Long Lived Assets Held For Sale [Member] | Eastern Energy Subsidiary [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Long Lived Assets Held For Sale [Member] | Tisza Subsidiary [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges 91 52  
Long Lived Assets Held For Sale [Member] | Tisza Subsidiary [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   42  
Long Lived Assets Held For Sale [Member] | Edelap, Edes, and Central Dique [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges   346  
Long Lived Assets Held For Sale [Member] | Edelap, Edes, and Central Dique [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Long Lived Assets Held For Sale [Member] | Borsod [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges   0  
Long Lived Assets Held For Sale [Member] | Borsod [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Long Lived Assets Held For Sale [Member] | Thames [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges   0  
Long Lived Assets Held For Sale [Member] | Thames [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Long Lived Assets Held For Sale [Member] | Brazil Telecom [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Asset Impairment Charges   (751)  
Long Lived Assets Held For Sale [Member] | Brazil Telecom [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Equity Method Affiliate [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Other non-operating expense 50    
Equity Method Affiliate [Member] | Yangcheng [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Other non-operating expense   74  
Equity Method Affiliate [Member] | Yangcheng [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   26  
Goodwill [Member] | DP&L [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Goodwill impairment 1,817    
Goodwill [Member] | Chigen [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Goodwill impairment   17  
Goodwill [Member] | Chigen [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Carrying Amount | Long Lived Assets Held And Used [Member] | Kelanitissa [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 29 66  
Carrying Amount | Long Lived Assets Held And Used [Member] | Wind projects [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 21    
Carrying Amount | Long Lived Assets Held And Used [Member] | Bohemia [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   14  
Carrying Amount | Long Lived Assets Held For Sale [Member] | Wind projects [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   22  
Carrying Amount | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 45 161  
Carrying Amount | Long Lived Assets Held For Sale [Member] | St Patrick [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 33    
Carrying Amount | Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   49  
Carrying Amount | Long Lived Assets Held For Sale [Member] | Eastern Energy Subsidiary [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   (123)  
Carrying Amount | Long Lived Assets Held For Sale [Member] | Tisza Subsidiary [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 105 94  
Carrying Amount | Long Lived Assets Held For Sale [Member] | Edelap, Edes, and Central Dique [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   350  
Carrying Amount | Long Lived Assets Held For Sale [Member] | Borsod [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   (9)  
Carrying Amount | Long Lived Assets Held For Sale [Member] | Thames [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   (7)  
Carrying Amount | Long Lived Assets Held For Sale [Member] | Brazil Telecom [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   142  
Carrying Amount | Equity Method Affiliate [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 205    
Carrying Amount | Equity Method Affiliate [Member] | Yangcheng [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   100  
Carrying Amount | Goodwill [Member] | DP&L [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 2,440    
Carrying Amount | Goodwill [Member] | Chigen [Member]
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   17  
Fair Value | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0 0  
Fair Value | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0 0  
Fair Value | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 10    
Fair Value | Long Lived Assets Held And Used [Member] | Wind projects [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Long Lived Assets Held And Used [Member] | Wind projects [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Long Lived Assets Held And Used [Member] | Wind projects [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Long Lived Assets Held And Used [Member] | Bohemia [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held And Used [Member] | Bohemia [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   5  
Fair Value | Long Lived Assets Held For Sale [Member] | Wind projects [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Wind projects [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0 0  
Fair Value | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0 45  
Fair Value | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 25    
Fair Value | Long Lived Assets Held For Sale [Member] | St Patrick [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Long Lived Assets Held For Sale [Member] | St Patrick [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 22    
Fair Value | Long Lived Assets Held For Sale [Member] | St Patrick [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Eastern Energy Subsidiary [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Eastern Energy Subsidiary [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Tisza Subsidiary [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0 0  
Fair Value | Long Lived Assets Held For Sale [Member] | Tisza Subsidiary [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 14 0  
Fair Value | Long Lived Assets Held For Sale [Member] | Tisza Subsidiary [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Long Lived Assets Held For Sale [Member] | Edelap, Edes, and Central Dique [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Edelap, Edes, and Central Dique [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   4  
Fair Value | Long Lived Assets Held For Sale [Member] | Borsod [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Borsod [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Thames [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Thames [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Brazil Telecom [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Long Lived Assets Held For Sale [Member] | Brazil Telecom [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   893  
Fair Value | Equity Method Affiliate [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Equity Method Affiliate [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 155    
Fair Value | Equity Method Affiliate [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Equity Method Affiliate [Member] | Yangcheng [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Equity Method Affiliate [Member] | Yangcheng [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Goodwill [Member] | DP&L [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Goodwill [Member] | DP&L [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 0    
Fair Value | Goodwill [Member] | DP&L [Member] | Level 3
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement 623    
Fair Value | Goodwill [Member] | Chigen [Member] | Level 1
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   0  
Fair Value | Goodwill [Member] | Chigen [Member] | Level 2
     
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]      
Fair Value, Nonrecurring measurement   $ 0