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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 13, 2021
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease) | $ 12,000,000 |  | $ 202,000,000 |  |  |
Adjustments to Additional Paid in Capital, Other | 8,000,000 |  | 88,000,000 |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | $ 4,000,000 |  | $ 114,000,000 |  |  |
Contributions from noncontrolling interests |  |  |  | $ 95,000,000 | $ 0 |
Equity Method Investment, Ownership Percentage | 10.00% |  |  | 10.00% |  |
Redeemable noncontrolling interest, percentage acquired by parent |  |  |  |  |  | 49.90%
AES Brasil [Domain] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 45.70% | 44.10% | 42.90% | 45.70% | 42.90% |
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% |  |  |  |  |
Chile Renovables SpA |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 51.00% |  |  | 51.00% |  |
Indirect Ownership Percentage in Subsidiary by Parent | 34.00% |  |  | 34.00% |  |
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 |  | $ 0.013 | $ 0.185 | 0.016 |  |
Acquisitions of noncontrolling interests |  |  | $ 240,000,000 | 17,000,000 |  |
Stockholders' Equity, Period Increase (Decrease) |  |  |  | 13,000,000 |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | 6,000,000 |  |
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% |  |  |  |  |
Cochrane Subsidiary [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Sale of Stock, Description of Transaction |  |  | 5 |  |  |
Sale of Stock, Consideration Received on Transaction |  |  | $ 113,000,000 |  |  |
Sale of Stock, Percentage of Ownership after Transaction |  |  | 38.00% |  |  |
Chile Renovables SpA |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Sale of Stock, Description of Transaction | 49 |  |  |  |  |
Sale of Stock, Consideration Received on Transaction | $ 53,000,000 |  |  |  |  |

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