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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 01, 2021 | Oct. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Mar. 04, 2021 | Dec. 31, 2020
Subsequent Event [Line Items] |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  | $ 91.0 | $ 41.0 |  |  |
Equity Method Investment, Ownership Percentage |  |  | 10.00% |  |  |  |
Equity Unit, Shares Issued |  |  | 10,430,500 |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  | $ 25.88 |
1.375% Senior Notes due 2026 [Domain] | Senior Notes [Member] | Corporate and Other [Member] | Secured Debt [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Issued senior notes |  |  | $ 800.0 |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 1.375% |  |  |  |
1.375% Senior Notes due 2026 [Domain] | Senior Notes [Member] | Corporate and Other [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Issued senior notes |  |  |  |  | $ 800.0 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 1.375% |  |
2.45% Senior Notes due 2031 [Domain] | Senior Notes [Member] | Corporate and Other [Member] | Secured Debt [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Issued senior notes |  |  | $ 1,000.0 |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 2.45% |  |  |  |
2.45% Senior Notes due 2031 [Domain] | Senior Notes [Member] | Corporate and Other [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Issued senior notes |  |  |  |  | $ 1,000.0 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 2.45% |  |
AES Brasil [Domain] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 45.70% | 42.90% |  |  | 44.10%
Uplight [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 30.60% |  | 32.30% |  |
Guacolda [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00% |  |
Fluence [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 43.20% |  | 50.00% |  |
AES Brasil [Domain] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 100.00% |  |  |  |
Subsequent Event [Member] | AES Brasil [Domain] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 46.70% |  |  |  |  |
Subsequent Event [Member] | Fluence [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 34.20% |  |  |  |  |  |
Proceeds from Divestiture of Businesses | $ 943.0 |  |  |  |  |  |
Equity Unit, Shares Issued | 35,650,000 |  |  |  |  |  |
Shares Issued, Price Per Share | $ 28 |  |  |  |  |  |
Subsequent Event [Member] | AES Brasil [Domain] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Equity Unit, Shares Issued |  | 93,000,000 |  |  |  |  |
Stock Issued During Period, Value, Other |  | $ 205.0 |  |  |  |  |

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