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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 13, 2021
Noncontrolling Interest [Line Items]
Stockholders' Equity, Period Increase (Decrease)	$ 12,000,000		$ 202,000,000
Adjustments to Additional Paid in Capital, Other	8,000,000		88,000,000
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	$ 4,000,000		$ 114,000,000
Contributions from noncontrolling interests				$ 95,000,000	$ 0
Equity Method Investment, Ownership Percentage	10.00%			10.00%
Redeemable noncontrolling interest, percentage acquired by parent						49.90%
AES Brasil [Domain]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	45.70%	44.10%	42.90%	45.70%	42.90%
AES Gener
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	67.10%			67.10%
Sale of Stock, Percentage of Ownership before Transaction	67.00%
Chile Renovables SpA
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	51.00%			51.00%
Indirect Ownership Percentage in Subsidiary by Parent	34.00%			34.00%
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			1,350,000,000
Investment Owned, at Cost	$ 205,000,000			$ 205,000,000
Contributions from noncontrolling interests	94,000,000
Other Noncontrolling Interests	$ 629,000,000			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		$ 0.013	$ 0.185	0.016
Acquisitions of noncontrolling interests			$ 240,000,000	17,000,000
Stockholders' Equity, Period Increase (Decrease)				13,000,000
Adjustments to Additional Paid in Capital, Other				6,000,000
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent				$ 7,000,000
Equity Method Investment, Ownership Percentage	100.00%			100.00%
Guaimbe Solar Complex [Member]
Noncontrolling Interest [Line Items]
Sale of Stock, Description of Transaction	19.9
Sale of Stock, Consideration Received on Transaction	$ 158,000,000
Sale of Stock, Percentage of Ownership after Transaction	36.30%
Sale of Stock, Percentage of Ownership before Transaction	45.30%
Cochrane Subsidiary [Member]
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%
Chile Renovables SpA
Noncontrolling Interest [Line Items]
Sale of Stock, Description of Transaction	49
Sale of Stock, Consideration Received on Transaction	$ 53,000,000

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