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Investments In and Advances To Affiliates (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | $ 1,422,000,000 |  |  |  | $ 1,320,000,000 |  |  |  | $ 1,422,000,000 | $ 1,320,000,000 | $ 1,157,000,000
Valuation Allowance Deferred Tax Asset Change In Amount |  |  |  |  |  |  |  |  | 374,000,000 | 322,000,000 |
Investments In And Advances To Affiliates Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 17,274,000,000 | 15,828,000,000 | 13,110,000,000
Gross margin | 1,095,000,000 | 1,029,000,000 | 1,005,000,000 | 1,005,000,000 | 1,030,000,000 | 963,000,000 | 989,000,000 | 954,000,000 | 4,134,000,000 | 3,936,000,000 | 3,357,000,000
Net income (loss) | 445,000,000 | 175,000,000 | 427,000,000 | 483,000,000 | (169,000,000) | 397,000,000 | 429,000,000 | 402,000,000 | 1,530,000,000 | 1,059,000,000 | 1,755,000,000
Current assets | 9,228,000,000 |  |  |  | 9,446,000,000 |  |  |  | 9,228,000,000 | 9,446,000,000 |
Current liabilities | 8,446,000,000 |  |  |  | 8,065,000,000 |  |  |  | 8,446,000,000 | 8,065,000,000 |
Noncurrent Liabilities | 27,080,000,000 |  |  |  | 21,973,000,000 |  |  |  | 27,080,000,000 | 21,973,000,000 |
Noncontrolling interests | 3,783,000,000 |  |  |  | 3,940,000,000 |  |  |  | 3,783,000,000 | 3,940,000,000 |
Stockholder's equity | 5,946,000,000 |  |  |  | 6,473,000,000 |  |  |  | 5,946,000,000 | 6,473,000,000 |
Undistributed Earnings Of Minority Owned Affiliates Included In Retained Earnings | 136,000,000 |  |  |  |  |  |  |  | 136,000,000 |  |
Distributions Received From Minority Owned Affiliates |  |  |  |  |  |  |  |  | 36,000,000 | 49,000,000 | 35,000,000
Basis Difference Between Carrying Amount And Investment | 145,000,000 |  |  |  |  |  |  |  | 145,000,000 |  |
Minority Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,668,000,000 | 1,341,000,000 | 1,229,000,000
Gross margin |  |  |  |  |  |  |  |  | 258,000,000 | 207,000,000 | 240,000,000
Net income (loss) |  |  |  |  |  |  |  |  | (5,000,000) | 100,000,000 | 110,000,000
Current assets | 1,182,000,000 |  |  |  | 948,000,000 |  |  |  | 1,182,000,000 | 948,000,000 |
Noncurrent assets | 4,298,000,000 |  |  |  | 4,131,000,000 |  |  |  | 4,298,000,000 | 4,131,000,000 |
Current liabilities | 899,000,000 |  |  |  | 687,000,000 |  |  |  | 899,000,000 | 687,000,000 |
Noncurrent Liabilities | 1,720,000,000 |  |  |  | 1,597,000,000 |  |  |  | 1,720,000,000 | 1,597,000,000 |
Noncontrolling interests | (240,000,000) |  |  |  | (206,000,000) |  |  |  | (240,000,000) | (206,000,000) |
Stockholder's equity | 3,101,000,000 |  |  |  | 3,001,000,000 |  |  |  | 3,101,000,000 | 3,001,000,000 |
Majority Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 24,000,000 | 20,000,000 | 158,000,000
Gross margin |  |  |  |  |  |  |  |  | 24,000,000 | 18,000,000 | 71,000,000
Net income (loss) |  |  |  |  |  |  |  |  | (5,000,000) | 7,000,000 | (5,000,000)
Current assets | 58,000,000 |  |  |  | 114,000,000 |  |  |  | 58,000,000 | 114,000,000 |
Noncurrent assets | 519,000,000 |  |  |  | 646,000,000 |  |  |  | 519,000,000 | 646,000,000 |
Current liabilities | 109,000,000 |  |  |  | 144,000,000 |  |  |  | 109,000,000 | 144,000,000 |
Noncurrent Liabilities | 269,000,000 |  |  |  | 242,000,000 |  |  |  | 269,000,000 | 242,000,000 |
Noncontrolling interests | 0 |  |  |  | 125,000,000 |  |  |  | 0 | 125,000,000 |
Stockholder's equity | 199,000,000 |  |  |  | 249,000,000 |  |  |  | 199,000,000 | 249,000,000 |
Solar Energy Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 225,000,000 |  |  |  | 256,000,000 |  |  |  | 225,000,000 | 256,000,000 |
Effective Ownership % | 50.00% |  |  |  | 50.00% |  |  |  | 50.00% | 50.00% |
Other Than Temporary Impairment Recognized At Investment Affiliate |  |  |  |  |  |  |  |  | 40,000,000 |  |
Other Than Temporary Impairment Recognized At Investment Affiliate Investor Impact | 20,000,000 |  |  |  |  |  |  |  | 20,000,000 |  |
Solar Power Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 91,000,000 |  |  |  | 8,000,000 |  |  |  | 91,000,000 | 8,000,000 |
Effective Ownership % | 50.00% |  |  |  | 50.00% |  |  |  | 50.00% | 50.00% |
AES Solar Power PR LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 8,000,000 |  |  |  | 0 |  |  |  | 8,000,000 | 0 |
Effective Ownership % | 50.00% |  |  |  | 0.00% |  |  |  | 50.00% | 0.00% |
Generation Capacity (MW) | 24 |  |  |  |  |  |  |  | 24 |  |
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 | 52,000,000 |  |  |  | 53,000,000 |  |  |  | 52,000,000 | 53,000,000 |
CEMIG [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 14,000,000 |  |  |  | 22,000,000 |  |  |  | 14,000,000 | 22,000,000 |
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 | 30,000,000 |  |  |  | 146,000,000 |  |  |  | 30,000,000 | 146,000,000 |
Effective Ownership % | 25.00% |  |  |  | 25.00% |  |  |  | 25.00% | 25.00% |
China Wind Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 75,000,000 |  |  |  | 69,000,000 |  |  |  | 75,000,000 | 69,000,000 |
Effective Ownership % | 49.00% |  |  |  | 49.00% |  |  |  | 49.00% | 49.00% |
Elsta Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 197,000,000 |  |  |  | 202,000,000 |  |  |  | 197,000,000 | 202,000,000 |
Effective Ownership % | 50.00% |  |  |  | 50.00% |  |  |  | 50.00% | 50.00% |
Guacolda Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 186,000,000 |  |  |  | 149,000,000 |  |  |  | 186,000,000 | 149,000,000 |
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 | 161,000,000 |  |  |  | 151,000,000 |  |  |  | 161,000,000 | 151,000,000 |
Effective Ownership % | 51.00% |  |  |  | 51.00% |  |  |  | 51.00% | 51.00% |
Innovent Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 32,000,000 |  |  |  | 31,000,000 |  |  |  | 32,000,000 | 31,000,000 |
Effective Ownership % | 40.00% |  |  |  | 40.00% |  |  |  | 40.00% | 40.00% |
JHRH Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 59,000,000 |  |  |  | 39,000,000 |  |  |  | 59,000,000 | 39,000,000 |
Effective Ownership % | 49.00% |  |  |  | 35.00% |  |  |  | 49.00% | 35.00% |
Investment In Joint Venture |  |  |  |  |  |  |  |  | 15,000,000 |  |
Investment Affiliate Incremental Ownership Percentage | 14.00% |  |  |  |  |  |  |  | 14.00% |  |
OPGC Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 203,000,000 |  |  |  | 224,000,000 |  |  |  | 203,000,000 | 224,000,000 |
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 | 19,000,000 |  |  |  | 20,000,000 |  |  |  | 19,000,000 | 20,000,000 |
Effective Ownership % | 10.00% |  |  |  | 10.00% |  |  |  | 10.00% | 10.00% |
Entek [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | 121,000,000 |  |  |  | 0 |  |  |  | 121,000,000 | 0 |
Effective Ownership % | 50.00% |  |  |  | 0.00% |  |  |  | 50.00% | 0.00% |
Generation Capacity (MW) | 312 |  |  |  |  |  |  |  | 312 |  |
Investment In Joint Venture |  |  | 13,000,000 |  |  |  |  |  |  |  |
Business Acquisition Cost Of Acquired Entity Cash Paid During Period |  |  |  | 136,000,000 |  |  |  |  | 149,000,000 |  |
SEB [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Release Of Affiliate Loan Amount |  |  |  |  |  |  |  |  |  | 1,400,000,000 |
Payment Received From Counterparty Settlement Amount |  |  |  |  |  |  |  |  |  | 25,000,000 |
Gain Recognized On Consummation Of Share Purchase Agreement |  |  |  |  |  |  |  |  |  | 115,000,000 |
Net Tax Expense Not Recorded As Equity Earnings Amount |  |  |  |  |  |  |  |  |  | 70,000,000 |
Other Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Investments In And Advances To Affiliates General Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to affiliates | $ 1,000,000 |  |  |  | $ 3,000,000 |  |  |  | $ 1,000,000 | $ 3,000,000 |

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