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Segments - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of strategic business units | segment			4
Number of reportable segments | segment			4
Total Revenue	$ 3,351	$ 3,289	$ 9,132	$ 9,316
Total Adjusted EBITDA	834	$ 720	2,120	$ 2,009
AES Andes
Segment Reporting Information [Line Items]
Total Revenue	256		675
Total Adjusted EBITDA	$ 19		$ 53

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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