Lease agreement maturity period.

No definition available.

Name:	d_LeaseAgreementMaturityPeriod
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Balance Type:	na
Period Type:	duration

- Definition

Leases.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Other deferred charges and other assets of right-of-use asset.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

+ References

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+ Details

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Balance Type:	credit
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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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+ Details

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- Details

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- Details

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- Details

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- Details

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Leases (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
Leases (Narrative) (Detail) - USD ($) $ in Millions	Sep. 30, 2026	Jun. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Virginia Electric and Power Company
Leases Disclosure [Line Items]
Lease agreement maturity period		15 years
Other deferred charges and other assets of right-of-use asset	$ 269			$ 269
Operating lease liabilities	270			270
Virginia Electric and Power Company \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:DeferredCreditsAndOtherLiabilities
Leases Disclosure [Line Items]
Operating lease liabilities	261			261
Virginia Electric and Power Company \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent
Leases Disclosure [Line Items]
Operating lease liabilities	9			9
Power Purchase Arrangement
Leases Disclosure [Line Items]
Rental revenue	6		$ 6	15	$ 15
Depreciation expense	$ 4		$ 4	$ 11	$ 9