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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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligations [Line Items]
Asset retirement obligation	$ 4,073	$ 3,925	$ 4,078	$ 2,538
Regulatory liability	$ 411		452
Asset retirement obligation, individual unit basis evaluation period	5 years
Accretion	$ 48	33
Nuclear Plant Decommissioning
Asset Retirement Obligations [Line Items]
Asset retirement obligation	3,277	3,133	$ 3,240	$ 1,742
Accretion	37	23
Nuclear Plant Decommissioning \| Operating Expense
Asset Retirement Obligations [Line Items]
Accretion	23	$ 9
Nuclear Plant Decommissioning \| Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Asset retirement obligation	1,812
Assets	$ 2,223