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Leases (Scheduled Maturities of Lease Liabilities) (Detail) $ in Millions	Dec. 31, 2021 USD ($)
Lessee Lease Disclosure [Line Items]
Maturity of Lease Liabilities, Operating, 2022	$ 50
Maturity of Lease Liabilities, Operating, 2023	41
Maturity of Lease Liabilities, Operating, 2024	33
Maturity of Lease Liabilities, Operating, 2025	27
Maturity of Lease Liabilities, Operating, 2026	24
Maturity of Lease Liabilities, Operating, After 2026	577
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	752
Present value adjustment, Operating	(244)
Present value of lease liabilities, Operating	508
Maturity of Lease Liabilities, Finance, 2022	32
Maturity of Lease Liabilities, Finance, 2023	39
Maturity of Lease Liabilities, Finance, 2024	33
Maturity of Lease Liabilities, Finance, 2025	18
Maturity of Lease Liabilities, Finance, 2026	15
Maturity of Lease Liabilities, Finance, After 2026	22
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	159
Present value adjustment, Finance	(11)
Present value of lease liabilities, Finance	148
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Maturity of Lease Liabilities, Operating, 2022	27
Maturity of Lease Liabilities, Operating, 2023	21
Maturity of Lease Liabilities, Operating, 2024	17
Maturity of Lease Liabilities, Operating, 2025	13
Maturity of Lease Liabilities, Operating, 2026	10
Maturity of Lease Liabilities, Operating, After 2026	240
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	328
Present value adjustment, Operating	(76)
Present value of lease liabilities, Operating	252
Maturity of Lease Liabilities, Finance, 2022	8
Maturity of Lease Liabilities, Finance, 2023	14
Maturity of Lease Liabilities, Finance, 2024	14
Maturity of Lease Liabilities, Finance, 2025	13
Maturity of Lease Liabilities, Finance, 2026	10
Maturity of Lease Liabilities, Finance, After 2026	17
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	76
Present value adjustment, Finance	(6)
Present value of lease liabilities, Finance	$ 70

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

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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).

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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).

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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).

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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).

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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).

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

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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).

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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).

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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).

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-Name Accounting Standards Codification
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-SubTopic 20
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Present value of lessee's discounted obligation for lease payments from operating lease.

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