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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02(12))
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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.

+ References

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-Topic 980
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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	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Asset Retirement Obligations [Line Items]
Asset retirement obligation	$ 4,146	$ 4,078	$ 3,986	$ 2,538
Regulatory liability	691	452
Nuclear decommissioning trusts	$ 4,930	4,440
Asset retirement obligation, individual unit basis evaluation period	5 years
Nuclear Plant Decommissioning
Asset Retirement Obligations [Line Items]
Asset retirement obligation	$ 3,365	3,240	$ 3,205	$ 1,742
Nuclear Plant Decommissioning \| Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Asset retirement obligation	1,852
Assets	2,543
Nuclear Plant Decommissioning - Other Noncurrent Liabilities \| Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Regulatory liability	$ 691	$ 452