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Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 08, 2017
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues   $ 2,643 $ 2,693 $ 2,613 $ 2,581 $ 2,660 $ 2,639 $ 2,452 $ 2,530 $ 10,530 $ 10,281 $ 11,260
Selected Quarterly Financial Information [Abstract]                        
Operating margin   643 642 625 554 632 691 556 501 2,464 2,380 2,663
Income (loss) from continuing operations, net of tax   (622) [1] 236 [1] 141 [1] 97 [1] (136) [2] 238 [2] 2 [2] 87 [2] (148) 191 682
Income (loss) from discontinued operations, net of tax   (664) 25 9 1 (557) (9) (389) (13)      
NET INCOME (LOSS)   (1,286) 261 150 98 (693) 229 (387) 74 (777) (777) 762
Net income (loss) attributable to The AES Corporation   $ (1,342) $ 152 $ 53 $ (24) $ (949) $ 175 $ (482) $ 126 $ (1,161) $ (1,130) $ 306
Basic income (loss) per share:                        
Income (loss) from continuing operations attributable to The AES Corporation common stockholders, net of tax   $ (1.03) $ 0.22 $ 0.08 $ 0.04 $ (0.35) $ 0.26 $ (0.15) $ 0.21 $ (0.77) $ (0.04) $ 0.46
Income (loss) from discontinued operations attributable to The AES Corporation common stockholders, net of tax   (1.00) 0.01 0.00 0.00 (1.09) 0.00 (0.58) (0.02) (0.99) (1.68) (0.01)
NET INCOME ATTRIBUTABLE TO THE AES CORPORATION COMMON STOCKHOLDERS   (2.03) 0.23 0.08 0.04 (1.44) 0.26 (0.73) 0.19 (1.76) (1.72) 0.45
Diluted income (loss) per share:                        
Income (loss) from continuing operations attributable to The AES Corporation common stockholders, net of tax   (1.03) 0.22 0.08 0.04 (0.35) 0.26 (0.15) 0.20 (0.77) (0.04) 0.46
Loss from discontinued operations attributable to The AES Corporation common stockholders, net of tax   (1.00) 0.01 0.00 0.00 (1.09) 0.00 (0.58) (0.01) (0.99) (1.68) (0.02)
NET INCOME ATTRIBUTABLE TO THE AES CORPORATION COMMON STOCKHOLDERS   (2.03) 0.23 0.08 0.04 (1.44) 0.26 (0.73) 0.19 (1.76) (1.72) 0.44
Dividends declared per common share $ 0.13 $ 0.25 $ 0.12 $ 0.00 $ 0.12 $ 0.23 $ 0.11 $ 0.00 $ 0.11 $ 0.49 $ 0.45 $ 0.41
Impairment expense pre-tax total   $ 277 $ 2 $ 90 $ 168 $ 623 $ 79 $ 235 $ 159      
Net equity in earnings of affiliates                   $ (71) $ (36) $ (105)
[1] Includes pre-tax impairment expense of $168 million, $90 million, $2 million and $277 million, for the first, second, third and fourth quarters of 2017, respectively. See Note 19—Asset Impairment Expense for further discussion.
[2] Includes pre-tax impairment expense of $159 million, $235 million, $79 million and $623 million, for the first, second, third and fourth quarters of 2016, respectively. See Note 19—Asset Impairment Expense for further discussion.