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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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