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Discontinued Operations And Held For Sale Businesses (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Gain (loss) on disposal and impairment, after taxes | $ 16 | $ 86 | $ 64
(Gain) loss on disposal and impairment write-down before tax and NCI | 84 | 388 | 209
Tax effect of gain on disposal of discontinued operations | 68 | 300 | 132
Asset impairment expense | 73 | 173 | 304
Fair Value of nonrecurring measurement | 35 |  |
Discontinued Operations Income Loss |  |  |
Revenue | 66 | 836 | 1,695
Income (loss) from operations of discontinued businesses | (10) | (157) | (770)
Income tax (expense) benefit | (3) | 26 | 284
Income (loss) from operations of discontinued businesses | (13) | (131) | (486)
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | 16 | 86 | 64
Red Oak [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) | 832 |  |
Ironwood [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) | 710 |  |
Red Oak and Ironwood [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Divestiture Of Ownership In Subsidiary Percent |  | 100.00% |
Sale Proceeds | 228 |  |
Gain (loss) on disposal and impairment, after taxes | 73 | 0 | 0
(Gain) loss on disposal and impairment write-down before tax and NCI | 73 |  |
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | 73 | 0 | 0
Eastern Energy Subsidiary [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) |  | 1,169 |
Gain (loss) on disposal and impairment, after taxes | 30 | 0 | 0
Asset impairment expense |  | 827 |
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | 30 | 0 | 0
Tisza I I Subsidiary [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) | 900 |  |
Divestiture Of Ownership In Subsidiary Percent | 100.00% |  |
Sale Proceeds | 14 |  |
Gain (loss) on disposal and impairment, after taxes | (87) | 0 | 0
Asset impairment expense |  | 52 | 85
Loss recognized due to CTA | 73 |  |
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | (87) | 0 | 0
Carbon Reduction Projects [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Divestiture Of Ownership In Subsidiary Percent |  | 100.00% |
Gain (loss) on disposal and impairment, after taxes | (6) | 0 | 0
Asset impairment expense |  | 40 |
Fair Value of nonrecurring measurement |  | 0 |
Carrying Amount |  | 49 |
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | (6) | 0 | 0
Edes [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Divestiture Of Ownership In Subsidiary Percent |  | 90.00% |
Customers Served |  | 172,000 |
Edelap [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Divestiture Of Ownership In Subsidiary Percent |  | 90.00% |
Customers Served |  | 329,000 |
Brazil Telecom [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Divestiture Of Ownership In Subsidiary Percent |  | 46.00% |
Sale Proceeds |  | 893 |
Gain (loss) on disposal and impairment, after taxes | 6 | 446 | 0
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | 6 | 446 | 0
Argentina Distribution [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Gain (loss) on disposal and impairment, after taxes | 0 | (338) | 0
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | 0 | (338) | 0
Wind projects [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Gain (loss) on disposal and impairment, after taxes | 0 | (22) | 0
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | 0 | (22) | 0
Subsidiary Barka [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) |  |  | 456
Divestiture Of Ownership In Subsidiary Percent |  |  | 35.00%
Sale Proceeds |  |  | 170
Sale Proceeds AES Portion |  |  | 124
Gain (loss) on disposal and impairment, after taxes | 0 | 0 | 80
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | 0 | 0 | 80
Barka Related Service Companies [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Divestiture Of Ownership In Subsidiary Percent |  |  | 100.00%
Lal Pir and Pak Gen [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Divestiture Of Ownership In Subsidiary Percent |  |  | 55.00%
Sale Proceeds |  |  | 117
Sale Proceeds AES Portion |  |  | 65
Gain (loss) on disposal and impairment, after taxes | 0 | 0 | (22)
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | 0 | 0 | (22)
Ras Laffan [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) |  |  | 756
Divestiture Of Ownership In Subsidiary Percent |  |  | 55.00%
Sale Proceeds |  |  | 234
Gain (loss) on disposal and impairment, after taxes | 0 | 0 | 6
Discontinued Operations Income Loss |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | $ 0 | $ 0 | $ 6
Borsod [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) |  | 161 |
Thames [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) |  | 208 |
Lal Pir [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) |  |  | 362
Pak Gen [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Generation Capacity (MW) |  |  | 365

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