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Equity (Transactions with Noncontrolling Interests) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 13, 2021 | Nov. 30, 2020 | Jan. 01, 2020
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  | $ (1,683,000,000) | $ (95,000,000) | $ 28,000,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 2,798,000,000 |  |  |  | 2,798,000,000 | 2,634,000,000 |  |  |  |
Additional Paid in Capital | 7,119,000,000 |  |  |  | 7,119,000,000 | 7,561,000,000 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (2,220,000,000) |  |  |  | (2,220,000,000) | (2,397,000,000) | (2,229,000,000) |  |  |
Redeemable noncontrolling interest, percentage acquired by parent |  |  |  |  |  |  |  | 49.90% |  |
Contributions from noncontrolling interests |  |  |  |  | 365,000,000 | 1,000,000 | 17,000,000 |  |  |
Retained Earnings (Accumulated Deficit) | $ (1,089,000,000) |  |  |  | $ (1,089,000,000) | (680,000,000) | (692,000,000) |  |  | $ (731,000,000)
AES Tiete [Domain] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 44.10% |  |  |  | 44.10% |  |  |  |  |
Chile Renovables SpA |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 51.00% |  | 51.00% |  |  |  |  |  |
AES Brasil |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 46.70% | 45.70% |  | 45.70% | 46.70% |  |  |  |  |
Distributed Energy [Member] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Sales to noncontrolling interests |  |  |  |  | $ 127,000,000 | $ 144,000,000 | 133,000,000 |  |  |
AES Southland [Domain] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership after Transaction |  |  |  |  | 65.00% |  |  |  |  |
Additional Paid in Capital | $ 266,000,000 |  |  |  | $ 266,000,000 |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  | 424,000,000 |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease) |  |  |  |  | $ 275,000,000 |  |  |  |  |
Sale of Stock, Description of Transaction |  |  |  |  | 35 |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  |  |  | $ 9,000,000 |  |  |  |  |
AES Tiete [Domain] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries | 16,000,000 |  |  | $ 240,000,000 |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent | $ 0.013 |  |  | $ 0.185 |  |  |  |  |  |
AES Tiete |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  |  |  |  | 94,000,000 |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease) |  |  |  |  | 214,000,000 |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  |  |  | $ 120,000,000 |  |  |  |  |
AES Gener |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership after Transaction |  |  |  | 38.00% |  |  |  |  |  |
Preferred Units, Cumulative Cash Distributions |  |  |  |  |  |  |  |  | $ 12,000,000 |
Preferred Stock, Participation Rights |  |  |  | 12 million |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  | $ 113,000,000 |  |  |  |  |  |
Sale of Stock, Description of Transaction |  |  |  | 5 |  |  |  |  |  |
Investments |  | $ 113,000,000 |  | $ 113,000,000 |  |  |  |  |  |
Chile Renovables SpA |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  | $ 53,000,000 |  |  |  |  |  |  |  |
Sale of Stock, Description of Transaction |  | 49 |  |  |  |  |  |  |  |
Indirect ownership percentage in subsidiary by parent |  | 34.00% |  | 34.00% |  |  |  |  |  |
Guaimbe Solar Complex [Member] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership before Transaction |  |  | 45.30% |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership after Transaction |  |  | 36.30% |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  | $ 158,000,000 |  |  |  |  |  |  |
Sale of Stock, Description of Transaction |  |  | 19.9 |  |  |  |  |  |  |
AES Andes |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership before Transaction |  |  |  |  | 67.10% | 67.00% |  |  |  |
Sale of Stock, Percentage of Ownership after Transaction |  |  |  |  | 67.00% | 67.10% |  |  |  |
Stockholders' Equity, Period Increase (Decrease) |  |  |  |  | $ 3,000,000 |  |  |  |  |
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 |  |  |  |
Other Noncontrolling Interests |  |  |  |  |  | 629,000,000 |  |  |  |
Contributions from noncontrolling interests |  |  |  |  |  | $ 94,000,000 |  |  |  |
Colon [Domain] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  | $ 8,000,000 |  |  |  |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease) |  | 12,000,000 |  |  |  |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  | $ 4,000,000 |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, percentage acquired by parent |  |  |  |  |  |  |  | 49.90% |  |
AES Brasil |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 100.00% |  |  |  |
Adjustments to Additional Paid in Capital, Other |  |  |  | $ 6,000,000 |  |  |  |  |  |
Sale of Stock, Percentage of Ownership before Transaction | 37.40% |  |  |  |  |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease) | $ 7,000,000 |  |  | 13,000,000 |  |  |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries |  |  |  | 17,000,000 |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent |  |  |  | 0.016 |  |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  |  | $ 7,000,000 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 93,000,000 |  |  |  |  |  |  |  |  |
Alto Maipo |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Period Increase (Decrease) | $ 182,000,000 |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 177,000,000 |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) | $ 5,000,000 |  |  |  | 5,000,000 |  |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  | 0 |  |  |  |  |
Sales to noncontrolling interests |  |  |  |  | (7,000,000) | $ 260,000,000 | (5,000,000) |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  | $ 9,000,000 | $ 89,000,000 | $ 0 |  |  |

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