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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Environmental Contingencies |  |  |  |  |  |
Liability recorded for projected environmental remediation costs |  |  |  | $ 4 | $ 4 |
AES Tiete [Domain] |  |  |  |  |  |
Litigation Contingencies |  |  |  |  |  |
Reversal of Cost of Goods | $ 6 |  | $ 184 |  |  |
AES Tiete [Domain] | Compensation from Concession Agreement |  |  |  |  |  |
Litigation Contingencies |  |  |  |  |  |
Other Intangible Assets, Net | $ 190 |  |  |  |  | $ 184
AES Tiete [Domain] | Compensation from Concession Agreement |  |  |  |  |  |
Litigation Contingencies |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period |  | 2 years 8 months 12 days |  |  |  |
Litigation [Member] |  |  |  |  |  |
Litigation Contingencies |  |  |  |  |  |
Aggregate reserves for claims deemed both probable and reasonably estimable |  |  |  | 28 | $ 23 |
Maximum [Member] | Litigation [Member] |  |  |  |  |  |
Environmental Contingencies |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  | 728 |  |
Maximum [Member] | Environmental Issue |  |  |  |  |  |
Environmental Contingencies |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  | 12 |  |
Minimum [Member] | Litigation [Member] |  |  |  |  |  |
Environmental Contingencies |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  | $ 247 |  |

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