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Investments In and Advances To Affiliates (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | $ 1,196 |  |  |  | $ 1,422 |  |  |  | $ 1,196 | $ 1,422 | $ 1,320
Valuation Allowance, Deferred Tax Asset, Change in Amount |  |  |  |  |  |  |  |  | 5 | (376) |
Investments In And Advances To Affiliates Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 18,141 | 16,923 | 15,443
Gross margin | 931 | 1,006 | 695 | 1,082 | 1,079 | 1,010 | 989 | 985 | 3,714 | 4,063 | 3,820
Net income (loss) | 323 | (1,402) | 207 | 515 | 445 | 175 | 427 | 483 | (357) | 1,530 | 1,059
Current assets | 8,465 |  |  |  | 9,229 |  |  |  | 8,465 | 9,229 |
Current liabilities | 8,319 |  |  |  | 8,438 |  |  |  | 8,319 | 8,438 |
Noncurrent Liabilities | 25,919 |  |  |  | 27,101 |  |  |  | 25,919 | 27,101 |
Noncontrolling interests | 2,945 |  |  |  | 3,783 |  |  |  | 2,945 | 3,783 |
Stockholder's equity | 4,569 |  |  |  | 5,946 |  |  |  | 4,569 | 5,946 |
Undistributed Earnings Of Minority Owned Affiliates Included In Retained Earnings | 150 |  |  |  |  |  |  |  | 150 |  |
Distributions Received From Minority Owned Affiliates |  |  |  |  |  |  |  |  | 22 | 36 | 49
Basis Difference Between Carrying Amount And Investment | 37 |  |  |  |  |  |  |  | 37 |  |
Minority Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,868 | 1,668 | 1,341
Gross margin |  |  |  |  |  |  |  |  | 355 | 258 | 207
Net income (loss) |  |  |  |  |  |  |  |  | 146 | (5) | 100
Current assets | 1,097 |  |  |  | 1,182 |  |  |  | 1,097 | 1,182 |
Noncurrent assets | 5,253 |  |  |  | 4,298 |  |  |  | 5,253 | 4,298 |
Current liabilities | 680 |  |  |  | 899 |  |  |  | 680 | 899 |
Noncurrent Liabilities | 2,899 |  |  |  | 1,720 |  |  |  | 2,899 | 1,720 |
Noncontrolling interests | (228) |  |  |  | (240) |  |  |  | (228) | (240) |
Stockholder's equity | 2,999 |  |  |  | 3,101 |  |  |  | 2,999 | 3,101 |
Majority Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 106 | 24 | 20
Gross margin |  |  |  |  |  |  |  |  | 26 | 24 | 18
Net income (loss) |  |  |  |  |  |  |  |  | (5) | (5) | 7
Current assets | 2 |  |  |  | 58 |  |  |  | 2 | 58 |
Noncurrent assets | 38 |  |  |  | 519 |  |  |  | 38 | 519 |
Current liabilities | 55 |  |  |  | 109 |  |  |  | 55 | 109 |
Noncurrent Liabilities | 20 |  |  |  | 269 |  |  |  | 20 | 269 |
Noncontrolling interests | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Stockholder's equity | (35) |  |  |  | 199 |  |  |  | (35) | 199 |
AES Solar Holding Co [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 307 |  |  |  | 324 |  |  |  | 307 | 324 |
Effective Ownership % | 50.00% |  |  |  | 50.00% |  |  |  | 50.00% | 50.00% |
Barry Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Effective Ownership % | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% |
Long Term Liabilities Associated With Debt Agreement Resulting In Loss Of Control | 55 |  |  |  | 52 |  |  |  | 55 | 52 |
Cartagena Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 0 |  |  |  |  |  |  |  | 0 |  |
Effective Ownership % | 14.00% |  |  |  |  |  |  |  | 14.00% |  |
CET Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 13 |  |  |  | 14 |  |  |  | 13 | 14 |
Effective Ownership % | 72.00% |  |  |  | 72.00% |  |  |  | 72.00% | 72.00% |
Chigen Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 2 |  |  |  | 30 |  |  |  | 2 | 30 |
Effective Ownership % | 35.00% |  |  |  | 25.00% |  |  |  | 35.00% | 25.00% |
China Wind Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 0 |  |  |  | 75 |  |  |  | 0 | 75 |
Effective Ownership % | 0.00% |  |  |  | 49.00% |  |  |  | 0.00% | 49.00% |
Elsta Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 219 |  |  |  | 197 |  |  |  | 219 | 197 |
Effective Ownership % | 50.00% |  |  |  | 50.00% |  |  |  | 50.00% | 50.00% |
Entek [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 234 |  |  |  | 121 |  |  |  | 234 | 121 |
Effective Ownership % | 50.00% |  |  |  | 50.00% |  |  |  | 50.00% | 50.00% |
Generation Capacity (MW) | 378 |  |  |  |  |  |  |  | 378 |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 82 |  |
Guacolda Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 196 |  |  |  | 186 |  |  |  | 196 | 186 |
Effective Ownership % | 35.00% |  |  |  | 35.00% |  |  |  | 35.00% | 35.00% |
Ictas Energy Group Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 0 |  |  |  | 161 |  |  |  | 0 | 161 |
Effective Ownership % | 0.00% |  |  |  | 51.00% |  |  |  | 0.00% | 51.00% |
Gain Recognized On Dissolution Of Joint Venture |  |  |  |  |  |  |  |  | 1 |  |
Proceeds Received On Dissolution Of Joint Venture |  |  |  |  |  |  |  |  | 10 |  |
InnoVent Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 0 |  |  |  | 32 |  |  |  | 0 | 32 |
Effective Ownership % | 0.00% |  |  |  | 40.00% |  |  |  | 0.00% | 40.00% |
JHRH Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 0 |  |  |  | 59 |  |  |  | 0 | 59 |
Effective Ownership % | 0.00% |  |  |  | 49.00% |  |  |  | 0.00% | 49.00% |
OPGC Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 199 |  |  |  | 203 |  |  |  | 199 | 203 |
Effective Ownership % | 49.00% |  |  |  | 49.00% |  |  |  | 49.00% | 49.00% |
Trinidad Generation Unlimited Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 24 |  |  |  | 19 |  |  |  | 24 | 19 |
Effective Ownership % | 10.00% |  |  |  | 10.00% |  |  |  | 10.00% | 10.00% |
Other Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | $ 2 |  |  |  | $ 1 |  |  |  | $ 2 | $ 1 |
IC Ictas Energy plants [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Effective Ownership % | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Generation Capacity (MW) | 62 |  |  |  |  |  |  |  | 62 |  |

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