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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Noncontrolling Interest [Line Items] |  |
Business Acquisition, Percentage of Voting Interests Acquired | 75.00% |
Adjustments to Additional Paid in Capital, Other | $ 4,000,000 |
Contributions from noncontrolling interests | $ 94,000,000 | $ 0
Equity Method Investment, Ownership Percentage | 10.00% |
AES Brasil [Domain] |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling Interest, Ownership Percentage by Parent | 45.30% |
AES Gener |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling Interest, Ownership Percentage by Parent | 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 |
Investment Owned, at Cost | $ 205,000,000 |
Contributions from noncontrolling interests | 94,000,000 |
Other Noncontrolling Interests | 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 | 0.012 |
Acquisitions of noncontrolling interests | 13,000,000 |
Stockholders' Equity, Period Increase (Decrease) | 10,000,000 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | $ 6,000,000 |
Equity Method Investment, Ownership Percentage | 100.00% |

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