Leases (Scheduled Maturities of Lease Liabilities) (Detail) $ in Millions	Dec. 31, 2022 USD ($)
Lessee Lease Disclosure [Line Items]
Maturity of Lease Liabilities, Operating, 2023	$ 44
Maturity of Lease Liabilities, Operating, 2024	36
Maturity of Lease Liabilities, Operating, 2025	30
Maturity of Lease Liabilities, Operating, 2026	27
Maturity of Lease Liabilities, Operating, 2027	25
Maturity of Lease Liabilities, Operating, After 2027	642
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	804
Present value adjustment, Operating	(251)
Present value of lease liabilities, Operating	553
Maturity of Lease Liabilities, Finance, 2023	52
Maturity of Lease Liabilities, Finance, 2024	45
Maturity of Lease Liabilities, Finance, 2025	25
Maturity of Lease Liabilities, Finance, 2026	20
Maturity of Lease Liabilities, Finance, 2027	14
Maturity of Lease Liabilities, Finance, After 2027	15
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	171
Present value adjustment, Finance	(21)
Present value of lease liabilities, Finance	150
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Maturity of Lease Liabilities, Operating, 2023	23
Maturity of Lease Liabilities, Operating, 2024	19
Maturity of Lease Liabilities, Operating, 2025	15
Maturity of Lease Liabilities, Operating, 2026	12
Maturity of Lease Liabilities, Operating, 2027	10
Maturity of Lease Liabilities, Operating, After 2027	314
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	393
Present value adjustment, Operating	(99)
Present value of lease liabilities, Operating	294
Maturity of Lease Liabilities, Finance, 2023	21
Maturity of Lease Liabilities, Finance, 2024	20
Maturity of Lease Liabilities, Finance, 2025	17
Maturity of Lease Liabilities, Finance, 2026	14
Maturity of Lease Liabilities, Finance, 2027	11
Maturity of Lease Liabilities, Finance, After 2027	13
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	96
Present value adjustment, Finance	(14)
Present value of lease liabilities, Finance	$ 82

Lessee, lease, disclosure.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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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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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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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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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).

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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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Namespace Prefix:	us-gaap_
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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