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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($) | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Noncontrolling Interest [Line Items] |  |
Payments to Acquire Additional Interest in Subsidiaries | $ 240,000,000 | $ 0
Stockholders' Equity, Period Increase (Decrease) | 202,000,000 |
Adjustments to Additional Paid in Capital, Other | 88,000,000 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | $ 114,000,000 |
AES Tiete [Domain] |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling Interest, Ownership Percentage by Parent | 42.90% |
AES Gener |  |
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% |
AES Tiete [Domain] |  |
Noncontrolling Interest [Line Items] |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent | $ 0.185 |
Payments to Acquire Additional Interest in Subsidiaries | $ 240,000,000 |

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