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Selected Quarterly Financial Data (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Selected Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 4,640 | $ 4,587 | $ 4,192 | $ 4,722 | $ 4,183 | $ 4,252 | $ 4,386 | $ 4,102 | $ 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
Income from continuing operations, net of tax | 377 | (1,400) | 139 | 524 | 453 | 210 | 430 | 482 | (360) | 1,575 | 1,481
Discontinued operations, net of tax | (54) | (2) | 68 | (9) | (8) | (35) | (3) | 1 |  |  |
NET INCOME (LOSS) | 323 | (1,402) | 207 | 515 | 445 | 175 | 427 | 483 | (357) | 1,530 | 1,059
Net income (loss) attributable to The AES Corporation | 175 | (1,568) | 140 | 341 | (209) | (131) | 174 | 224 | (912) | 58 | 9
Impairment Expense Pre Tax Total | $ (31.00) | $ 1.89 | $ 18.00 | $ 10.00 | $ 10.00 | $ 147.00 | $ 33.00 |  |  |  |
Common Stock Dividends Per Share Declared | $ 0.04 | $ 0.04 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0.08 | $ 0 | $ 0
Basic Income (Loss) Per Share |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to The AES Corporation common stockholders, net of tax | $ 0.31 | $ (2.10) | $ 0.09 | $ 0.46 | $ 0.18 | $ (0.08) | $ 0.24 | $ 0.29 | $ (1.21) | $ 0.63 | $ 0.64
Income (loss) from discontinued operations attributable to The AES Corporation common stockholders, net of tax | $ (0.08) | $ 0 | $ 0.09 | $ (0.01) | $ (0.45) | $ (0.09) | $ (0.02) | $ (0.01) | $ 0 | $ (0.56) | $ (0.63)
Income From Continuing Operations Attributable To The AES Corporation Common Stockholders Per Share | $ 0.23 | $ (2.10) | $ 0.18 | $ 0.45 | $ (0.27) | $ (0.17) | $ 0.22 | $ 0.28 | $ (1.21) | $ 0.07 | $ 0.01
Diluted Income (Loss) Per Share |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to The AES Corporation common stockholders, net of tax | $ 0.31 | $ (2.10) | $ 0.09 | $ 0.45 | $ 0.18 | $ (0.08) | $ 0.24 | $ 0.29 | $ (1.21) | $ 0.63 | $ 0.64
Discontinued operations attributable to The AES Corporation common stockholders, net of tax | $ (0.08) | $ 0 | $ 0.09 | $ (0.01) | $ (0.45) | $ (0.09) | $ (0.02) | $ (0.01) | $ 0 | $ (0.56) | $ (0.63)
Basic income (loss) per share attributable to The AES Corporation | $ 0.23 | $ (2.10) | $ 0.18 | $ 0.44 | $ (0.27) | $ (0.17) | $ 0.22 | $ 0.28 | $ (1.21) | $ 0.07 | $ 0.01
Dividends declared per common share | $ 0.04 | $ 0.04 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0.08 | $ 0 | $ 0

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