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Regulatory Assets and Liabilities (Narrative) (Detail) $ in Billions	Mar. 31, 2024 USD ($)
Public Utilities General Disclosures [Line Items]
Regulatory assets not expect to earn return	$ 5.8
Period for which expenditures are expected to be recovered	2 years
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Regulatory assets not expect to earn return	$ 4.5
Period for which expenditures are expected to be recovered	2 years

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Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base.

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-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
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Remaining recovery period of regulatory assets for which no return on investment during recovery period is provided, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Topic 980
-SubTopic 340
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-Section 50
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