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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Table Text Block |
Equity Ownership Interest And Carrying Values Of Investments Accounted For Under The Equity Method |
|  |  |  | December 31,
Affiliate |  | Country |  | 2012 |  | 2011 |  | 2012 |  | 2011
|  |  |  | Carrying Value |  | Ownership Interest %
|  |  |  | (in millions) |  |  |  |
AES Solar Holding Co(1) |  | Various |  | $ | 307 |  | $ | 324 |  | 50% |  | 50%
Barry(2) |  | United Kingdom |  |  | - |  |  | - |  | 100% |  | 100%
Cartagena(3) |  | Spain |  |  | - |  |  | N/A |  | 14% |  | N/A
CET(2) |  | Brazil |  |  | 13 |  |  | 14 |  | 72% |  | 72%
Chigen affiliates (4) |  | China |  |  | 2 |  |  | 30 |  | 35% |  | 25%
China Wind(5) |  | China |  |  | - |  |  | 75 |  | 0% |  | 49%
Elsta |  | Netherlands |  |  | 219 |  |  | 197 |  | 50% |  | 50%
Entek(6) |  | Turkey |  |  | 234 |  |  | 121 |  | 50% |  | 50%
Guacolda |  | Chile |  |  | 196 |  |  | 186 |  | 35% |  | 35%
IC Ictas Energy Group(6) |  | Turkey |  |  | - |  |  | 161 |  | 0% |  | 51%
InnoVent(2),(7) |  | France |  |  | - |  |  | 32 |  | 0% |  | 40%
JHRH(8) |  | China |  |  | - |  |  | 59 |  | 0% |  | 49%
OPGC |  | India |  |  | 199 |  |  | 203 |  | 49% |  | 49%
Trinidad Generation Unlimited(2) |  | Trinidad |  |  | 24 |  |  | 19 |  | 10% |  | 10%
Other affiliates |  | Various |  |  | 2 |  |  | 1 |  |  |  |
Total investments in and advances to affiliates |  | $ | 1,196 |  | $ | 1,422 |  |  |  |
Investments In and Advances to Affiliates Financial Information |
|  | 50%-or-less Owned Affiliates |  | Majority-Owned Unconsolidated Subsidiaries
Years ended December 31, |  | 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
|  | (in millions) |  | (in millions)
Revenue |  | $ | 1,868 |  | $ | 1,668 |  | $ | 1,341 |  | $ | 106 |  | $ | 24 |  | $ | 20
Gross margin |  |  | 355 |  |  | 258 |  |  | 207 |  |  | 26 |  |  | 24 |  |  | 18
Net income (loss) |  |  | 146 |  |  | (5) |  |  | 100 |  |  | (5) |  |  | (5) |  |  | 7
December 31, |  | 2012 |  | 2011 |  |  |  |  | 2012 |  | 2011 |  |  |
|  | (in millions) |  |  |  |  | (in millions) |  |  |
Current assets |  | $ | 1,097 |  | $ | 1,182 |  |  |  |  | $ | 2 |  | $ | 58 |  |  |
Noncurrent assets |  |  | 5,253 |  |  | 4,298 |  |  |  |  |  | 38 |  |  | 519 |  |  |
Current liabilities |  |  | 680 |  |  | 899 |  |  |  |  |  | 55 |  |  | 109 |  |  |
Noncurrent liabilities |  |  | 2,899 |  |  | 1,720 |  |  |  |  |  | 20 |  |  | 269 |  |  |
Noncontrolling interests |  |  | (228) |  |  | (240) |  |  |  |  |  | - |  |  | - |  |  |
Stockholders' equity |  |  | 2,999 |  |  | 3,101 |  |  |  |  |  | (35) |  |  | 199 |  |  |
Goodwill By Segments |
|  |  |  | US - |  | US - |  | Andes - |  | MCAC - |  | EMEA - |  | Asia - |  | Corporate |  |  |
|  |  |  | Generation |  | Utilities |  | Generation |  | Generation |  | Generation |  | Generation |  | and Other |  | Total
Balance as of December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Goodwill |  | $ | 106 |  | $ | - |  | $ | 899 |  | $ | 16 |  | $ | 180 |  | $ | 80 |  | $ | 133 |  | $ | 1,414
| Accumulated impairment losses |  |  | (21) |  |  | - |  |  | - |  |  | - |  |  | (122) |  |  | - |  |  | - |  |  | (143)
|  | Net balance |  |  | 85 |  |  | - |  |  | 899 |  |  | 16 |  |  | 58 |  |  | 80 |  |  | 133 |  |  | 1,271
| Impairment losses |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (17) |  |  | - |  |  | (17)
| Goodwill acquired during the year |  |  | - |  |  | 2,576 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 2,576
| Foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | and other |  |  | (10) |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (10)
Balance as of December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Goodwill |  |  | 96 |  |  | 2,576 |  |  | 899 |  |  | 16 |  |  | 180 |  |  | 80 |  |  | 133 |  |  | 3,980
| Accumulated impairment losses |  |  | (21) |  |  | - |  |  | - |  |  | - |  |  | (122) |  |  | (17) |  |  | - |  |  | (160)
|  | Net balance |  |  | 75 |  |  | 2,576 |  |  | 899 |  |  | 16 |  |  | 58 |  |  | 63 |  |  | 133 |  |  | 3,820
| Impairment losses |  |  | - |  |  | (1,817) |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (1,817)
| Goodwill associated with the |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | sale of a business |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -(1) |  |  | - |  |  | -
| Foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | and other |  |  | (9) |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 5 |  |  | - |  |  | (4)
Balance as of December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Goodwill |  |  | 87 |  |  | 2,576 |  |  | 899 |  |  | 16 |  |  | 180 |  |  | 68 |  |  | 133 |  |  | 3,959
| Accumulated impairment losses |  |  | (21) |  |  | (1,817) |  |  | - |  |  | - |  |  | (122) |  |  | - |  |  | - |  |  | (1,960)
|  | Net balance |  | $ | 66 |  | $ | 759 |  | $ | 899 |  | $ | 16 |  | $ | 58 |  | $ | 68 |  | $ | 133 |  | $ | 1,999
Other Intangible Assets |
|  |  | December 31, 2012 |  | December 31, 2011
|  |  | Gross |  | Accumulated |  | Net |  | Gross |  | Accumulated |  | Net
|  |  | Balance |  | Amortization |  | Balance |  | Balance |  | Amortization |  | Balance
|  |  |  | (in millions) |  | (in millions)
Subject to Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project development rights(1) |  | $ | 102 |  | $ | (1) |  | $ | 101 |  | $ | 109 |  | $ | (1) |  | $ | 108
Sales concessions |  |  | 194 |  |  | (101) |  |  | 93 |  |  | 199 |  |  | (95) |  |  | 104
Contractual payment rights(2) |  |  | 72 |  |  | (23) |  |  | 49 |  |  | 69 |  |  | (13) |  |  | 56
Management rights |  |  | 40 |  |  | (14) |  |  | 26 |  |  | 39 |  |  | (13) |  |  | 26
Emission allowances |  |  | 4 |  |  | - |  |  | 4 |  |  | 14 |  |  | - |  |  | 14
Electric security plan |  |  | 87 |  |  | (87) |  |  | - |  |  | 87 |  |  | (9) |  |  | 78
Contracts |  |  | 44 |  |  | (20) |  |  | 24 |  |  | 44 |  |  | (17) |  |  | 27
Customer contracts and relationships |  |  | 66 |  |  | (26) |  |  | 40 |  |  | 66 |  |  | (7) |  |  | 59
Other(3) |  |  | 15 |  |  | (4) |  |  | 11 |  |  | 18 |  |  | (9) |  |  | 9
| Subtotal |  |  | 624 |  |  | (276) |  |  | 348 |  |  | 645 |  |  | (164) |  |  | 481
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land use rights |  |  | 50 |  |  | - |  |  | 50 |  |  | 52 |  |  | - |  |  | 52
Water rights |  |  | 18 |  |  | - |  |  | 18 |  |  | 5 |  |  | - |  |  | 5
Trademark/Trade name |  |  | 6 |  |  | - |  |  | 6 |  |  | 5 |  |  | - |  |  | 5
Other |  |  | 7 |  |  | - |  |  | 7 |  |  | 2 |  |  | - |  |  | 2
| Subtotal |  |  | 81 |  |  | - |  |  | 81 |  |  | 64 |  |  | - |  |  | 64
Total |  | $ | 705 |  | $ | (276) |  | $ | 429 |  | $ | 709 |  | $ | (164) |  | $ | 545
Schedule Of Acquired Intangible Assets By Major Class [Text Block] |
|  |  | December 31, 2012
|  |  |  |  | Subject to |  |  |  |
|  |  |  |  |  | Amortization/ |  | Weighted Average |  | Amortization
|  |  | Amount |  | Indefinite-Lived |  | Amortization Period |  | Method
|  |  | (in millions) |  |  |  | (in years) |  |  |
Renewable energy certificates |  | $ | 5 |  | Subject to amortization |  |  | Various |  |  | As utilized
Water rights |  |  | 13 |  | Indefinite-lived |  |  | N/A |  |  | N/A
Other |  |  | 1 |  | Indefinite-lived |  |  | N/A |  |  | N/A
Total |  | $ | 19 |  |  |  |  |  |  |  |
|  |  | December 31, 2011
|  |  |  |  | Subject to |  |  |  |
|  |  |  |  |  | Amortization/ |  | Weighted Average |  | Amortization
|  |  | Amount |  | Indefinite-Lived |  | Amortization Period |  | Method
|  |  | (in millions) |  |  |  | (in years) |  |  |
Electric security plan(1) (2) |  | $ | 87 |  | Subject to amortization |  |  | 1 |  |  | Straight line
Customer relationships(1) (3) |  |  | 32 |  | Subject to amortization |  |  | 12 |  |  | Other
Customer contracts(1) (4) |  |  | 28 |  | Subject to amortization |  |  | 3 |  |  | Other
Trademark/Trade name(1) (5) |  |  | 5 |  | Indefinite-lived |  |  | N/A |  |  | N/A
Other |  |  | 4 |  | Subject to amortization |  |  | Various |  |  | As utilized
Total |  | $ | 156 |  |  |  |  |  |  |  |
Schedule of Expected Amortization Expense [Table Text Block] |
|  |  | Estimated amortization expense
|  |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | 2017
|  |  |  | (in millions)
| Customer relationships & contracts |  | $ | 11 |  | $ | 5 |  | $ | 4 |  | $ | 3 |  | $ | 3
| Sales concessions |  |  | 8 |  |  | 8 |  |  | 8 |  |  | 8 |  |  | 8
| Contractual payment rights |  |  | 9 |  |  | 9 |  |  | 9 |  |  | 3 |  |  | 3
| All other |  |  | 4 |  |  | 3 |  |  | 3 |  |  | 3 |  |  | 2
| Total |  | $ | 32 |  | $ | 25 |  | $ | 24 |  | $ | 17 |  | $ | 16

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