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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Noncontrolling Interest [Line Items] |  |  |
Adjustments to Additional Paid in Capital, Other |  | $ 6,000,000 |
Contributions from noncontrolling interests |  | $ 95,000,000 | $ 0
Equity Method Investment, Ownership Percentage | 10.00% | 10.00% |
AES Brasil [Domain] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 45.70% | 45.70% |
AES Gener |  |  |
Noncontrolling Interest [Line Items] |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 67.10% | 67.10% |
Sale of Stock, Percentage of Ownership before Transaction | 67.00% |  |
AES Gener |  |  |
Noncontrolling Interest [Line Items] |  |  |
Stock Issued During Period, Shares, New Issues | 1,980,000,000 |  |
Common Stock, Shares Subscribed but Unissued | 1,350,000,000 | 1,350,000,000 |
Investment Owned, at Cost | $ 205,000,000 | $ 205,000,000 |
Contributions from noncontrolling interests | 94,000,000 |  |
Other Noncontrolling Interests | $ 629,000,000 | 629,000,000 |
AES Brasil [Domain] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent |  | 0.016 |
Acquisitions of noncontrolling interests |  | 17,000,000 |
Stockholders' Equity, Period Increase (Decrease) |  | 13,000,000 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  | $ 7,000,000 |
Equity Method Investment, Ownership Percentage | 100.00% | 100.00% |
Guaimbe Solar Complex [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Sale of Stock, Description of Transaction | 19.9 |  |
Sale of Stock, Consideration Received on Transaction | $ 158,000,000 |  |
Sale of Stock, Percentage of Ownership after Transaction | 36.30% |  |
Sale of Stock, Percentage of Ownership before Transaction | 45.30% |  |

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