The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Fair value portion of asset recognized for present right to economic benefit.

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Amount of expense recovery for known and estimated future costs arising from requirement to perform environmental remediation.

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Adjustment of the mine reclamation or mine shutdown liability account that is made when estimates of future costs are changed.

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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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Asset Retirement Obligations - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligations [Line Items]
Environmental Remediation Expense Recovery Statement of Income or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag	mining reclamation and other coal ash remediation
Asset retirement obligation	$ 4,078	$ 2,538	$ 2,437
Regulatory liability	$ 452	209
Asset retirement obligation, individual unit basis evaluation period	5 years
Mining Properties and Mineral Rights
Asset Retirement Obligations [Line Items]
Mining reclamation	$ 546
Coal
Asset Retirement Obligations [Line Items]
Coal ash remediation	546
Nuclear Plant Decommissioning
Asset Retirement Obligations [Line Items]
Asset retirement obligation	3,240	$ 1,742	$ 1,688
Nuclear Plant Decommissioning \| Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Asset retirement obligation	1,797
Assets	2,249
Nuclear Plant Decommissioning - Other Noncurrent Liabilities \| Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Regulatory liability	$ 452