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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- Definition

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

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- Definition

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 Obligation, Individual Unit Basis Evaluation Period

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Asset Retirement Obligations [Line Items]

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Asset Retirement Obligations - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Asset Retirement Obligations [Line Items]
Asset retirement obligation	$ 4,099	$ 4,078	$ 3,953	$ 2,538
Regulatory liability	$ 565	452
Asset retirement obligation, individual unit basis evaluation period	5 years
Nuclear Plant Decommissioning
Asset Retirement Obligations [Line Items]
Asset retirement obligation	$ 3,315	3,240	$ 3,169	$ 1,742
Nuclear Plant Decommissioning \| Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Asset retirement obligation	1,825
Assets	2,390
Nuclear Plant Decommissioning - Other Noncurrent Liabilities \| Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Regulatory liability	$ 565	$ 452