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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 268 | $ 318 | $ 310
General and administrative expenses |  |  |  |  |  |  |  |  | (165) | (196) | (192)
Other expense |  |  |  |  |  |  |  |  | (53) | (80) | (58)
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  | (186) | (169) | (188)
Interest expense |  |  |  |  |  |  |  |  | (1,038) | (1,050) | (1,056)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (192) | (277) | (509)
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (216) | (352) | (708)
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION | $ 318 | $ (333) | $ (83) | $ 144 | $ (78) | $ 210 | $ 17 | $ 154 | 46 | 303 | 1,203
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from subsidiaries and affiliates |  |  |  |  |  |  |  |  | 29 | 30 | 36
Equity in earnings of subsidiaries and affiliates |  |  |  |  |  |  |  |  | 383 | 674 | 1,909
Interest income |  |  |  |  |  |  |  |  | 31 | 53 | 39
General and administrative expenses |  |  |  |  |  |  |  |  | (125) | (148) | (142)
Other income |  |  |  |  |  |  |  |  | 26 | 1 | 25
Other expense |  |  |  |  |  |  |  |  | (6) | (103) | 0
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  | (146) | (5) | (171)
Interest expense |  |  |  |  |  |  |  |  | (163) | (197) | (220)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 29 | 305 | 1,476
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 17 | (2) | (273)
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION |  |  |  |  |  |  |  |  | $ 46 | $ 303 | $ 1,203

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