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Fair Value (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Available-for-sale securities
Dec. 31, 2010
Available-for-sale securities
Dec. 31, 2011
Interest Rate Derivatives
Dec. 31, 2010
Interest Rate Derivatives
Dec. 31, 2011
Cross Currency Swaps
Dec. 31, 2010
Cross Currency Swaps
Dec. 31, 2011
Foreign Currency
Dec. 31, 2010
Foreign Currency
Dec. 31, 2011
Commodity & Other
Dec. 31, 2010
Commodity & Other
Dec. 31, 2011
Yangcheng [Member]
mw
Dec. 31, 2010
Deepwater Subsidiary [Member]
Feb. 01, 2011
Thames [Member]
mw
Dec. 31, 2011
Recurring [Member]
Dec. 31, 2010
Recurring [Member]
Dec. 31, 2011
Nonrecurring [Member]
Carbon Reduction Projects [Member]
Dec. 31, 2011
Nonrecurring [Member]
Edelap Edes And Central Dique [Member]
mw
Dec. 31, 2011
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Wind Turbines And Deposits [Member]
Dec. 31, 2011
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Kelanitissa [Member]
Dec. 31, 2011
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Bohemia [Member]
Dec. 31, 2010
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Southland Huntington Beach Subsidiary [Member]
Dec. 31, 2011
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Tisza I I Subsidiary [Member]
Dec. 31, 2010
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Tisza I I Subsidiary [Member]
Dec. 31, 2010
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Deepwater Subsidiary [Member]
Dec. 31, 2011
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Carbon Reduction Projects [Member]
Dec. 31, 2011
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Brazil Telecom [Member]
Dec. 31, 2011
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Borsod [Member]
Dec. 31, 2011
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Eastern Energy Subsidiary [Member]
Dec. 31, 2010
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Eastern Energy Subsidiary [Member]
Dec. 31, 2010
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Subsidiary Barka [Member]
Dec. 31, 2010
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Subsidiary Ras Laffan [Member]
Dec. 31, 2011
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Edelap Edes And Central Dique [Member]
Dec. 31, 2011
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Wind Projects [Member]
Dec. 31, 2011
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Thames [Member]
Dec. 31, 2011
Nonrecurring [Member]
Goodwill [Member]
Chigen [Member]
Dec. 31, 2010
Nonrecurring [Member]
Goodwill [Member]
Deepwater Subsidiary [Member]
Dec. 31, 2010
Nonrecurring [Member]
Goodwill [Member]
Other Subsidiary [Member]
Dec. 31, 2011
Nonrecurring [Member]
Equity Method Affiliate [Member]
Yangcheng [Member]
Dec. 31, 2011
Level 1 [Member]
Recurring [Member]
Dec. 31, 2010
Level 1 [Member]
Recurring [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Wind Turbines And Deposits [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Kelanitissa [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Bohemia [Member]
Dec. 31, 2010
Level 1 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Southland Huntington Beach Subsidiary [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Tisza I I Subsidiary [Member]
Dec. 31, 2010
Level 1 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Tisza I I Subsidiary [Member]
Dec. 31, 2010
Level 1 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Deepwater Subsidiary [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Carbon Reduction Projects [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Brazil Telecom [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Borsod [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Eastern Energy Subsidiary [Member]
Dec. 31, 2010
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Eastern Energy Subsidiary [Member]
Dec. 31, 2010
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Subsidiary Barka [Member]
Dec. 31, 2010
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Subsidiary Ras Laffan [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Edelap Edes And Central Dique [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Wind Projects [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Thames [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Goodwill [Member]
Chigen [Member]
Dec. 31, 2010
Level 1 [Member]
Nonrecurring [Member]
Goodwill [Member]
Deepwater Subsidiary [Member]
Dec. 31, 2010
Level 1 [Member]
Nonrecurring [Member]
Goodwill [Member]
Other Subsidiary [Member]
Dec. 31, 2011
Level 1 [Member]
Nonrecurring [Member]
Equity Method Affiliate [Member]
Yangcheng [Member]
Dec. 31, 2011
Level 2 [Member]
Recurring [Member]
Dec. 31, 2010
Level 2 [Member]
Recurring [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Wind Turbines And Deposits [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Kelanitissa [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Bohemia [Member]
Dec. 31, 2010
Level 2 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Southland Huntington Beach Subsidiary [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Tisza I I Subsidiary [Member]
Dec. 31, 2010
Level 2 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Tisza I I Subsidiary [Member]
Dec. 31, 2010
Level 2 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Deepwater Subsidiary [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Carbon Reduction Projects [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Brazil Telecom [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Borsod [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Eastern Energy Subsidiary [Member]
Dec. 31, 2010
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Eastern Energy Subsidiary [Member]
Dec. 31, 2010
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Subsidiary Barka [Member]
Dec. 31, 2010
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Subsidiary Ras Laffan [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Edelap Edes And Central Dique [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Wind Projects [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Thames [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Goodwill [Member]
Chigen [Member]
Dec. 31, 2010
Level 2 [Member]
Nonrecurring [Member]
Goodwill [Member]
Deepwater Subsidiary [Member]
Dec. 31, 2010
Level 2 [Member]
Nonrecurring [Member]
Goodwill [Member]
Other Subsidiary [Member]
Dec. 31, 2011
Level 2 [Member]
Nonrecurring [Member]
Equity Method Affiliate [Member]
Yangcheng [Member]
Dec. 31, 2011
Level 3 [Member]
Recurring [Member]
Dec. 31, 2010
Level 3 [Member]
Recurring [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Wind Turbines And Deposits [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Kelanitissa [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Bohemia [Member]
Dec. 31, 2010
Level 3 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Southland Huntington Beach Subsidiary [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Tisza I I Subsidiary [Member]
Dec. 31, 2010
Level 3 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Tisza I I Subsidiary [Member]
Dec. 31, 2010
Level 3 [Member]
Nonrecurring [Member]
Long Lived Assets Held and Used [Member]
Deepwater Subsidiary [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Carbon Reduction Projects [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Brazil Telecom [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Borsod [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Eastern Energy Subsidiary [Member]
Dec. 31, 2010
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Eastern Energy Subsidiary [Member]
Dec. 31, 2010
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Subsidiary Barka [Member]
Dec. 31, 2010
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Subsidiary Ras Laffan [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Edelap Edes And Central Dique [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Wind Projects [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Discontinued Operations and Businesses Held For Sale [Member]
Thames [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Goodwill [Member]
Chigen [Member]
Dec. 31, 2010
Level 3 [Member]
Nonrecurring [Member]
Goodwill [Member]
Deepwater Subsidiary [Member]
Dec. 31, 2010
Level 3 [Member]
Nonrecurring [Member]
Goodwill [Member]
Other Subsidiary [Member]
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
Equity Method Affiliate [Member]
Yangcheng [Member]
Dec. 31, 2011
Carrying Amount [Member]
Dec. 31, 2010
Carrying Amount [Member]
Dec. 31, 2011
Fair Value [Member]
Dec. 31, 2010
Fair Value [Member]
Assets                                                                                                                                                                                                                                    
Marketable securities $ 1,356 $ 1,760                                                                                                                                                                                                                         $ 1,356 $ 1,760 $ 1,356 $ 1,760
Derivative assets 120 119                                                                                                                                                                                                                         120 119 120 119
Total assets                                                                                                                                                                                                                             1,476 1,879 1,476 1,879
Liabilities                                                                                                                                                                                                                                    
Debt                                                                                                                                                                                                                             22,020 18,199 22,502 18,725
Derivative liabilities 690 358                                                                                                                                                                                                                         690 358 690 358
Total liabilities                                                                                                                                                                                                                             22,710 18,557 23,192 19,083
Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]                                                                                                                                                                                                                                    
Available-for-sale securities                                 1,340 1,750                                               1 8                                           1,339 1,700                                           0 42                                                  
Trading securities                                 12 10                                               12 10                                           0 0                                           0 0                                                  
Derivatives                                 120 119                                               2 0                                           52 58                                           66 61                                                  
Total Assets                                 1,472 1,879                                               15 18                                           1,391 1,758                                           66 103                                                  
Derivatives                                 690 358                                               0 0                                           476 346                                           214 12                                                  
Total Liabilities                                 690 358                                               0 0                                           476 346                                           214 12                                                  
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]                                                                                                                                                                                                                                    
Carrying Amount                             18           161 66 14 288 94 160 83 49 142 (9) (123) 827 20 120 350 22 (7) 17 18 3 100                                                                                                                                                  
Fair Value                                     5                                                 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0     45 0 5 0 0 0 0 0 893 0 0 0 124 226 4 0 0 0 0 0 0     0 24 0 88 42 75 4 0 0 0 0 0 0 0 0 0 0 0 0 0 26        
(Gain)/Loss 225 389 20                                   116 42 9 200 52 85 79                                                                                                                                                                              
(Gain) loss on disposal and impairment write-down - discontinued operations 388 209 (150)                                                 40 (751) 0 0 827 (104) (106) 346 22 0                                                                                                                                                          
Other non-operating expense 82 7 12                                                                           74                                                                                                                                                  
Goodwill impairment 17 21 122                       18                                             17 18 3                                                                                                                                                    
Generation Capacity (MW)                           2,100   208       68                                                                                                                                                                                            
Ownership Interest In Subsidiary                           25.00%                                                                                                                                                                                                        
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                                                                                                                                                                                                                                    
Balance at beginning of period 49 0       (1) (12) 10 (12) 22 0 18 24                                                                                                                                                                                                          
Total gains (losses) (realized and unrealized):                                                                                                                                                                                                                                    
Included in earnings (43) 51       0 1 (4) 4 32 25 (71) 21                                                                                                                                                                                                          
Included in other comprehensive income (50) 1       (13) (12) (37) 13 0 0 0 0                                                                                                                                                                                                          
Included in regulatory assets 8 (2)       0 (3) 0 0 0 0 8 1                                                                                                                                                                                                          
Settlements 2 (17)       0 7 13 5 (3) (1) (8) (28)                                                                                                                                                                                                          
Transfers of assets (liabilities) into Level 3 (117) (2)       (117) 0 0 0 0 (2) 0 0                                                                                                                                                                                                          
Transfers of (assets) liabilities out of Level 3 3 18       3 18 0 0 0 0 0 0                                                                                                                                                                                                          
Balance at end of period (148) 49 0     (128) (1) (18) 10 51 22 (53) 18                                                                                                                                                                                                          
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities held at the end of the period (44) 40       0 0 (2) 7 29 24 (71) 9                                                                                                                                                                                                          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                                                                                                                                                                    
Balance at beginning of period       42 42                                                                                                                                                                                                                          
Settlements       (42) 0                                                                                                                                                                                                                          
Balance at end of period       0 42                                                                                                                                                                                                                          
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets held at the end of the period       $ 0 $ 0