Leases (Scheduled Maturities of Lease Liabilities) (Detail) $ in Millions	Dec. 31, 2024 USD ($)
Lessee Lease Disclosure [Line Items]
Maturity of Lease Liabilities, Operating, 2025	$ 41
Maturity of Lease Liabilities, Operating, 2026	39
Maturity of Lease Liabilities, Operating, 2027	36
Maturity of Lease Liabilities, Operating, 2028	35
Maturity of Lease Liabilities, Operating, 2029	34
Maturity of Lease Liabilities, Operating, After 2029	1,131
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	1,316
Present value adjustment, Operating	(636)
Present value of lease liabilities, Operating	680
Maturity of Lease Liabilities, Finance, 2025	78
Maturity of Lease Liabilities, Finance, 2026	69
Maturity of Lease Liabilities, Finance, 2027	64
Maturity of Lease Liabilities, Finance, 2028	56
Maturity of Lease Liabilities, Finance, 2029	40
Maturity of Lease Liabilities, Finance, After 2029	17
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	324
Present value adjustment, Finance	(48)
Present value of lease liabilities, Finance	276
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Maturity of Lease Liabilities, Operating, 2025	25
Maturity of Lease Liabilities, Operating, 2026	23
Maturity of Lease Liabilities, Operating, 2027	22
Maturity of Lease Liabilities, Operating, 2028	21
Maturity of Lease Liabilities, Operating, 2029	20
Maturity of Lease Liabilities, Operating, After 2029	740
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	851
Present value adjustment, Operating	(430)
Present value of lease liabilities, Operating	421
Maturity of Lease Liabilities, Finance, 2025	43
Maturity of Lease Liabilities, Finance, 2026	36
Maturity of Lease Liabilities, Finance, 2027	32
Maturity of Lease Liabilities, Finance, 2028	26
Maturity of Lease Liabilities, Finance, 2029	18
Maturity of Lease Liabilities, Finance, After 2029	17
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	172
Present value adjustment, Finance	(27)
Present value of lease liabilities, Finance	$ 145

Lessee, lease, disclosure.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

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Amount of lessee's undiscounted obligation for lease payments for finance lease.

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

+ References

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

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