Acquisitions and Dispositions (Details)	3 Months Ended				12 Months Ended
	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2025
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Business					$ 58,000,000	$ 351,000,000	$ 134,000,000
Proceeds from Divestiture of Businesses and Interests in Affiliates					108,000,000	423,000,000	254,000,000
Income from continuing operations available to The AES Corporation common stockholders					949,000,000	1,686,000,000	242,000,000
Dispositions and Held-for-Sales Businesses
Asset Retirement Obligation, Revision of Estimate					143,000,000	127,000,000
Goodwill, Written off Related to Sale of Business Unit					3,000,000
Goodwill					342,000,000	345,000,000	348,000,000
Property, Plant and Equipment, Net					37,818,000,000	33,166,000,000
Inventory, Net					612,000,000	593,000,000
Asset Retirement Obligation					1,224,000,000	$ 920,000,000	778,000,000
Mong Duong held-dfor-sale [Member]
Dispositions and Held-for-Sales Businesses
Debt, Long-Term and Short-Term, Combined Amount					399,000,000
JORDAN | AES Jordan
Dispositions and Held-for-Sales Businesses
Equity Method Investment, Ownership Percentage				10.00%
JK Projects
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets Carrying Amount Disclosure Nonrecurring					45,000,000
Dispositions and Held-for-Sales Businesses
Property, Plant and Equipment, Net					16,000,000
Deferred Tax Assets, Goodwill and Intangible Assets					$ 20,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong Subsidiary [Member]
Dispositions and Held-for-Sales Businesses
Disposal Group Not Discontinued Operation Ownership Interest Sold					51.00%	51.00%
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong Finance Holdings B.V._Related Party [Member]
Dispositions and Held-for-Sales Businesses
Disposal Group Not Discontinued Operation Ownership Interest Sold					51.00%	51.00%
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong held-dfor-sale [Member]
Dispositions and Held-for-Sales Businesses
long term Concession receivable					$ 862,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Alto Maipo
Dispositions and Held-for-Sales Businesses
Disposal Group Not Discontinued Operation Ownership Interest Sold					99.00%
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Jordan (IPP1 & IPP4)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses					$ 58,000,000
Dispositions and Held-for-Sales Businesses
Disposal Group Not Discontinued Operation Ownership Interest Sold		26.00%		26.00%
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Dominican Republic Renewables
Dispositions and Held-for-Sales Businesses
Disposal Group Not Discontinued Operation Ownership Interest Sold					50.00%
Disposal Group Not Discontinued Operation Ownership Interest Retained					0.50
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | AES Brasil
Dispositions and Held-for-Sales Businesses
Disposal Group Not Discontinued Operation Ownership Interest Sold					47.30%			47.30%
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Ventanas
Dispositions and Held-for-Sales Businesses
Disposal Group Not Discontinued Operation Ownership Interest Sold					100.00%
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | JK Projects
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets Carrying Amount Disclosure Nonrecurring					$ 0.51
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax					8,000,000	$ 11,000,000	80,000,000
Dispositions and Held-for-Sales Businesses
Income (Loss) from Individually Significant Component Disposed of or Held-for-Sale, Excluding Discontinued Operations, before Income Tax					12,000,000	33,000,000	182,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Jordan (IPP1 & IPP4)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses				$ 45,000,000
Dispositions and Held-for-Sales Businesses
Divestiture of Business, sales price				$ 58,000,000	58,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Dominican Republic Renewables
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Business					70,000,000
Dispositions and Held-for-Sales Businesses
Divestiture of Business, sales price					103,000,000
Retained Interest, Fair Value Disclosure					37,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | AES Brasil
Dispositions and Held-for-Sales Businesses
Divestiture of Business, sales price					586,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Ventanas
Dispositions and Held-for-Sales Businesses
Divestiture of Business, sales price					5,000,000
AES Brasil
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Business					$ 312,000,000
Jordan (IPP1 & IPP4)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Business		$ 10,000,000
Dispositions and Held-for-Sales Businesses
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal					10.00%
AES Brasil [Domain]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of			$ 25,000,000		$ 55,000,000
AES Brasil [Domain] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax					0	7,000,000	49,000,000
Dispositions and Held-for-Sales Businesses
Income (Loss) from Individually Significant Component Disposed of or Held-for-Sale, Excluding Discontinued Operations, before Income Tax					0	21,000,000	116,000,000
AES Jordan | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax					0	5,000,000	21,000,000
Dispositions and Held-for-Sales Businesses
Income (Loss) from Individually Significant Component Disposed of or Held-for-Sale, Excluding Discontinued Operations, before Income Tax					0	15,000,000	57,000,000
Ventanas | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax					0	3,000,000	13,000,000
Dispositions and Held-for-Sales Businesses
Income (Loss) from Individually Significant Component Disposed of or Held-for-Sale, Excluding Discontinued Operations, before Income Tax					0	3,000,000	13,000,000
Dominican Republic Renewables | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax					8,000,000	(4,000,000)	(3,000,000)
Dispositions and Held-for-Sales Businesses
Income (Loss) from Individually Significant Component Disposed of or Held-for-Sale, Excluding Discontinued Operations, before Income Tax					12,000,000	(6,000,000)	(4,000,000)
Mong Duong held-dfor-sale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of		$ 17,000,000			(226,000,000)	$ 62,000,000	$ 167,000,000
Dispositions and Held-for-Sales Businesses
Impairment Charge on Reclassified Assets	$ 243,000,000
Long Lived Assets Held And Used [Member] | Mong Duong held-dfor-sale [Member]
Dispositions and Held-for-Sales Businesses
Impairment Charge on Reclassified Assets					$ 239,000,000