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Employee Benefit Plans (Fair Values of Pension and Post Retirement Plan Assets by Asset Category) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Preferred stock | $ 0 | $ 170
Pending sales of securities and advanced subscriptions | 298 | 177
Net accrued income | 24 | 27
Pending purchases of securities | 54 | 180
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Preferred stock | 0 | 10
Pending sales of securities and advanced subscriptions | 17 | 10
Net accrued income | 2 | 2
Pending purchases of securities | $ 2 | $ 10

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- Definition Defined benefit plan, net accrued income. + References No definition available. + Details
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Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Defined benefit plan, pending purchases of securities. + References No definition available. + Details
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Balance Type: | debit
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- Definition Defined benefit plan pending sales of securities and advanced subscriptions. + References No definition available. + Details
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- Definition Defined benefit plan preferred stock. + References No definition available. + Details
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Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Balance Type: |
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- Details
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Balance Type: |
Period Type: |