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Equity Equity - Net Income (Loss) Attributable to The AES Corporation (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
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to The AES Corporation | $ (78) | $ 210 | $ 17 | $ 154 | $ 128 | $ 101 | $ 290 | $ 684 | $ 303 | $ 1,203 | $ (1,161)
Transfers from the noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Net transfers (to) from noncontrolling interest |  |  |  |  |  |  |  |  | (5) | (3) | 253
Change from net income (loss) attributable to The AES Corporation and transfers (to) from noncontrolling interests |  |  |  |  |  |  |  |  | 298 | 1,200 | (908)
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |
Transfers from the noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in The AES Corporation's paid-in capital for sale of subsidiary shares |  |  |  |  |  |  |  |  | (5) | (3) | 13
Increase (decrease) in The AES Corporation's paid-in-capital for purchase of subsidiary shares |  |  |  |  |  |  |  |  | 0 | 0 | 240
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |
Transfers from the noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in The AES Corporation's paid-in capital for sale of subsidiary shares |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 0
Increase (decrease) in The AES Corporation's paid-in-capital for purchase of subsidiary shares |  |  |  |  |  |  |  |  |  |  | $ 0

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