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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, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to The AES Corporation | $ (632) | $ 343 | $ 28 | $ (148) | $ 318 | $ (333) | $ (83) | $ 144 | $ (409) | $ 46 | $ 303
Transfers from the noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Net transfers (to) from noncontrolling interest |  |  |  |  |  |  |  |  | (16) | 171 | (5)
Change from net income attributable to The AES Corporation and transfers (to) from noncontrolling interests |  |  |  |  |  |  |  |  | (425) | 217 | 298
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 |  |  |  |  |  |  |  |  | (7) | 260 | (5)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  |  |  |  | (9) | (89) | 0
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
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  |  |  |  | $ 0 | $ 0 |

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