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Debt - Non-Recourse Debt Narrative (Details)	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025
Debt Instrument [Line Items]
Proceeds From Issuance Of Nonrecourse Debt				$ 4,397,000,000	$ 5,199,000,000
Loss on extinguishment of debt	$ (2,000,000)	$ (1,000,000)		(15,000,000)	$ (11,000,000)
Restricted Net Assets	911,000,000			911,000,000
Restricted Cash Held for Insurance	166,000,000			166,000,000		$ 155,000,000
Materiality Threshold for Sub Default to Trigger Cross Default	200,000,000			200,000,000
Supplier Finance Program, Obligation	1,046,000,000			1,046,000,000		917,000,000
Supplier Finance Program, guaranteed by Sub	387,000,000			387,000,000		371,000,000
Accounts Payable and Accrued Liabilities
Debt Instrument [Line Items]
Supplier Finance Program, Obligation	767,000,000			767,000,000		616,000,000
Supplier Finance Program, guaranteed by Parent	380,000,000			380,000,000		245,000,000
Minimum [Member] | Accounts Payable and Accrued Liabilities
Debt Instrument [Line Items]
Supplier Finance Program, Obligation	1,000,000			1,000,000		1,000,000
Maximum [Member] | Accounts Payable and Accrued Liabilities
Debt Instrument [Line Items]
Supplier Finance Program, Obligation	$ 51,000,000			$ 51,000,000		$ 69,000,000
Weighted Average [Member] | Accounts Payable and Accrued Liabilities
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.46%			6.46%		6.83%
Consolidated Variable Interest Entities [Member]
Debt Instrument [Line Items]
Restricted Cash	$ 528,000,000			$ 528,000,000
Restricted Cash And Debt Service Reserves	791,000,000			791,000,000
Restricted Cash
Debt Instrument [Line Items]
Restricted Cash And Debt Service Reserves	438,000,000			438,000,000		$ 79,000,000
Debt service reserve
Debt Instrument [Line Items]
Restricted Cash And Debt Service Reserves	88,000,000			88,000,000		68,000,000
Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Restricted Cash And Debt Service Reserves	526,000,000			526,000,000		147,000,000
Mong Duong held-for-sale
Debt Instrument [Line Items]
Debt, Long-Term and Short-Term, Combined Amount	$ 466,000,000			$ 466,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Dominican Republic Renewables
Debt Instrument [Line Items]
Disposal Group Not Discontinued Operation Ownership Interest Sold	50.00%			50.00%
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Mong Duong Subsidiary [Member]
Debt Instrument [Line Items]
Disposal Group Not Discontinued Operation Ownership Interest Sold	51.00%			51.00%
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff | Mong Duong held-for-sale
Debt Instrument [Line Items]
Long term Concession receivable	$ 874,000,000			$ 874,000,000
Variable Rate [Domain] | Notes Payable to Banks
Debt Instrument [Line Items]
Non-recourse debt	2,200,000,000			2,200,000,000
Variable Rate [Domain] | Notes Payable to Banks
Debt Instrument [Line Items]
Non-recourse debt	10,700,000,000			10,700,000,000
Senior Notes due 2032 | Recourse
Debt Instrument [Line Items]
Issued senior notes	$ 800,000,000			$ 800,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.80%			5.80%
3.30% Senior Notes due 2025 [Domain] | Recourse
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ 2,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.30%			3.30%
950 Million Junior Notes Due 2055 | Junior Notes | Corporate Other And Other Eliminations [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 950,000,000			$ 950,000,000
Debt Instrument, Interest Rate, Stated Percentage	7.60%			7.60%
Clean Energy | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Proceeds From Issuance Of Nonrecourse Debt				$ 1,643,000,000
AES Clean Energy Subsidiary | Revolving Credit Facilities, Joint and Several
Debt Instrument [Line Items]
Credit Facility, Commitments Used	$ 2,000,000,000			2,000,000,000
AES El Salvador | Nonrecourse [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt				341,000,000
AES El Salvador | AES El Salvador Debt | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Repayments of Debt				206,000,000
AES El Salvador | El Salvador Credit Agreement $341M | Nonrecourse [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt				1,000,000
AES El Salvador | El Salvador Credit Agreement $341M | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 341,000,000			$ 341,000,000
AES Clean Energy and sPower (co-issuers) | Master Indenture Notes | Nonrecourse [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.70%			6.70%
AES Clean Energy and sPower (co-issuers) | Master Indenture Notes | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Proceeds From Issuance Of Nonrecourse Debt				$ 823,000,000
Increase in Nonrecourse Debt				801,000,000
Carrying Amount of Nonrecourse Debt				2,200,000,000
Nonrecourse Debt				3,000,000,000
AES Clean Energy Development | Revolving Credit Facilities, Joint and Several
Debt Instrument [Line Items]
Line of Credit Facility, Increase (Decrease), Net				(904,000,000)
Credit Facility, Commitments Used	$ 2,200,000,000			$ 2,200,000,000
AES Clean Energy Development | Bellefield Financing Agreement due 2026 | Nonrecourse [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.00%			4.00%
Credit Facility, Commitments Used	$ 1,000,000,000			$ 1,000,000,000
Credit facility, commitments						1,700,000,000
AES Clean Energy Development | Bellefield Financing Agreement due 2026 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Credit facility, commitments	1,700,000,000			1,700,000,000		2,400,000,000
AES Clean Energy and sPower (co-borrowers) | Revolving Credit Facilities, Joint and Several
Debt Instrument [Line Items]
Issued senior notes	3,700,000,000			3,700,000,000
AES Puerto Rico | PR Series A Bond due 2026 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 156,000,000			$ 156,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.625%			6.625%
Preferred Shares Conversion Option				0.999
AES Puerto Rico | PR Senior Secured Bonds due 2028 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 112,000,000			$ 112,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.625%			6.625%
AES Puerto Rico | Preferred Shares in AES Guayama Holdings | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 44,000,000			$ 44,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.125%			3.125%
AES Puerto Rico | PR Bridge Loan due 2026 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 23,000,000			$ 23,000,000
Debt Instrument, Basis Spread on Variable Rate				4.00%
AES Indiana | Nonrecourse [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt				$ 350,000,000
AES Indiana | AES Indiana FM Bonds due 2054 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 650,000,000			$ 650,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.70%			5.70%
AES Indiana | IPALCO Notes due 2034 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 400,000,000			$ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.75%			5.75%
AES Indiana | IPL Term Loan Due 2024 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Repayments of Debt				$ 300,000,000
AES Indiana | AES Indiana Credit Agreement due 2027 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 30,000,000			$ 350,000,000
AES Indiana | IPALCO Senior Notes due 2025 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%			3.70%
Repayments of Debt				$ 405,000,000
AES Indiana | AES Indiana FM Bonds due 2035 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 350,000,000			$ 350,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.05%			5.05%
AES Indiana | IPL Term Loan Due 2025 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Repayments of Debt				$ 300,000,000
AES Indiana | AES Ohio FM Bonds due 2030 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 375,000,000			$ 375,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.55%			4.55%
Repayments of Debt				$ 195,000,000
AES Indiana | DPL Term Loan Due 2025 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Repayments of Debt				$ 150,000,000
AES Indiana | El Salvador Credit Agreement $341M | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%			3.50%
AES Andes | Nonrecourse [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt				$ 520,000,000
AES Andes | Andes Senior Notes due 2029 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Proceeds From Issuance Of Nonrecourse Debt				$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.30%			6.30%
AES Andes | Andes Senior Unsecured Notes due 2079 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Redeemed notes				$ 100,000,000
AES Andes | Andes Senior Unsecured Notes due 2025 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Redeemed notes				43,000,000
AES Andes | 6.35% Senior notes due 2079 | Nonrecourse [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt				3,000,000
Proceeds from Issuance of Debt				$ 228,000,000
AES Andes | 6.35% Senior notes due 2079 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.35%			6.35%
AES Andes | 5.00% Senior notes due 2025 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%			5.00%
AES Andes | Andes Junior Notes due 2055 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Proceeds From Issuance Of Nonrecourse Debt						$ 530,000,000
AES Andes | Andes Junior Notes due 2055 | Nonrecourse [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							8.15%
AES Andes | 7.125% Senior notes due 2079 | Nonrecourse Debt [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ (8,000,000)
AES Andes | 7.125% Senior notes due 2079 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							7.125%
AES Andes | Andes Senior Notes due 2032 | Nonrecourse [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%			6.25%
Proceeds from Issuance of Debt				$ 400,000,000
AES Puerto Rico Solar
Debt Instrument [Line Items]
Loan Guarentee	$ 861,000,000			861,000,000
Outstanding borrowings	$ 676,000,000			$ 676,000,000
Project ownership	70.00%			70.00%
Line of Credit Facility, Remaining Borrowing Capacity	$ 202,000,000			$ 202,000,000
AES Puerto Rico Solar | Nonrecourse [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt				$ 871,000,000
AES Puerto Rico Solar | Puerto Rico Solar Tax Credit Transfer Bridge Loan Agreement | Nonrecourse Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.25%			1.25%
AES Puerto Rico Solar | Puerto Rico Solar Tax Credit Transfer Bridge Loan Agreement | Nonrecourse Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.25%			2.25%
AES Puerto Rico Solar | Puerto Rico Solar Tax Credit Transfer Bridge Loan Agreement | Nonrecourse [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 230,000,000			$ 230,000,000
Dominican Republic Renewables
Debt Instrument [Line Items]
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest before Disposal	33.00%
AES Ohio | Nonrecourse [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt				$ 375,000,000

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