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v2.4.0.6

Fair Value (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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Data Type: | xbrli:monetaryItemType
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets). Such unrealized (holding) gains or losses relate to those derivative assets and liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory assets or liabilities. + References No definition available. + Details
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References No definition available. + Details
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- Definition This element represents transfers in to derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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- Definition This element represents transfers out of derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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- Definition This element represents net derivative assets and liabilities measured at fair value using significant unobservable inputs (Level 3) which are required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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- Definition Settlements that have taken place during the period in relation to derivative assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents total financial assets at the balance sheet date. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents total financial liabilities at the balance sheet date. + References No definition available. + Details
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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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