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Fair Value (Nonrecurring Measurements) (Details)	3 Months Ended				6 Months Ended	9 Months Ended
	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 ARS ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	May 15, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs		$ (184,000,000)	$ (175,000,000)		$ (175,000,000)	$ (161,000,000)		$ (184,000,000)	$ (131,000,000)	$ (115,000,000)		$ (220,000,000)
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs		(73,000,000)	(71,000,000)		(71,000,000)	(15,000,000)		(73,000,000)	$ (22,000,000)	$ (21,000,000)		$ (110,000,000)
Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs						(2,000,000)
Commodity Option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs						(16,000,000)
Other Credit Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs						$ 3,000,000
Mong Duong held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Selling Expense	$ 5,000,000
AES Brasil [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Selling Expense					13,000,000
Weighted Average [Member] | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Commodity prices							$ 68.41
Underlying, Derivative						46.87
Maximum [Member] | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Commodity prices							132.30
Underlying, Derivative						75.68
Minimum [Member] | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Commodity prices							$ 13.36
Underlying, Derivative						23.83
Long Lived Assets held and Used | Uplight
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment reversals (expense)						$ 60,000,000
Long Lived Assets held and Used | Carrying Amount [Member] | Uplight
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring						60,000,000
Long Lived Assets held and Used | Carrying Amount [Member] | Uplight | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring						0
Long Lived Assets held and Used | Carrying Amount [Member] | Uplight | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring						0
Long Lived Assets held and Used | Carrying Amount [Member] | Uplight | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring						$ 0
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Estimate of Fair Value Measurement [Member] | Mong Duong held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring	383,000,000	407,000,000	390,000,000	$ 450,000,000	390,000,000			407,000,000
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Estimate of Fair Value Measurement [Member] | Mong Duong held-for-sale | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring	0	0	0	0	0			0
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Estimate of Fair Value Measurement [Member] | Mong Duong held-for-sale | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring	371,000,000	400,000,000	389,000,000	413,000,000	389,000,000			400,000,000
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Estimate of Fair Value Measurement [Member] | Mong Duong held-for-sale | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring	0	0	0	0	0			0
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Estimate of Fair Value Measurement [Member] | AES Brasil [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring		1,581,000,000						1,581,000,000			$ 1,577,000,000
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Estimate of Fair Value Measurement [Member] | AES Brasil [Domain] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring		0						0			0
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Estimate of Fair Value Measurement [Member] | AES Brasil [Domain] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring		1,548,000,000						1,548,000,000			1,565,000,000
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Estimate of Fair Value Measurement [Member] | AES Brasil [Domain] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring		0						0			$ 0
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Mong Duong held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment reversals (expense)	$ 17,000,000	$ 11,000,000	$ 6,000,000	$ 37,000,000
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | AES Brasil [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment reversals (expense)					$ 25,000,000			$ 55,000,000

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