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Schedule I - Condensed Financial Information of Parent Schedule I - Condensed Financial Information of Parent (Statement of Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
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
Condensed Income Statements, Captions [Line Items]                      
Interest income                 $ 244 $ 245 $ 256
General and administrative expenses                 (215) (194) (196)
Other income                 120 64 84
Other expense                 (57) (79) (24)
Loss on extinguishment of debt                 (68) (13) (182)
Interest expense                 (1,170) (1,134) (1,145)
Income (loss) before income taxes                 (521) 354 513
Income tax benefit (expense)                 (990) (32) (412)
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION $ (1,342) $ 152 $ 53 $ (24) $ (949) $ 175 $ (482) $ 126 (1,161) (1,130) 306
Parent Company                      
Condensed Income Statements, Captions [Line Items]                      
Revenue from subsidiaries and affiliates                 28 14 24
Equity in earnings of subsidiaries and affiliates                 630 (615) 859
Interest income                 49 19 24
General and administrative expenses                 (158) (144) (154)
Other income                 5 7 24
Other expense                 (554) (65) (6)
Loss on extinguishment of debt                 (92) (14) (105)
Interest expense                 (317) (344) (364)
Income (loss) before income taxes                 (409) (1,142) 302
Income tax benefit (expense)                 (752) 12 4
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION                 $ (1,161) $ (1,130) $ 306