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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]                      
Interest income                 $ 318 $ 310 $ 244
General and administrative expenses                 (196) (192) (215)
Other income                 145 72 120
Other expense                 (80) (58) (58)
Loss on extinguishment of debt                 (169) (188) (68)
Interest expense                 (1,050) (1,056) (1,170)
Income (loss) before income taxes                 (277) (509) (521)
Income tax (expense)                 (352) (708) (990)
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION $ (78) $ 210 $ 17 $ 154 $ 128 $ 101 $ 290 $ 684 303 1,203 (1,161)
Parent Company                      
Condensed Income Statements, Captions [Line Items]                      
Revenue from subsidiaries and affiliates                 30 36 28
Equity in earnings of subsidiaries and affiliates                 674 1,909 630
Interest income                 53 39 49
General and administrative expenses                 (148) (142) (158)
Other income                 1 25 5
Other expense                 (103) 0 (554)
Loss on extinguishment of debt                 (5) (171) (92)
Interest expense                 (197) (220) (317)
Income (loss) before income taxes                 305 1,476 (409)
Income tax (expense)                 (2) (273) (752)
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION                 $ 303 $ 1,203 $ (1,161)