Leases (Scheduled Maturities of Lease Liabilities) (Detail) $ in Millions	Dec. 31, 2020 USD ($)
Lessee Lease Disclosure [Line Items]
Maturity of Lease Liabilities, Operating, 2021	$ 64
Maturity of Lease Liabilities, Operating, 2022	56
Maturity of Lease Liabilities, Operating, 2023	47
Maturity of Lease Liabilities, Operating, 2024	40
Maturity of Lease Liabilities, Operating, 2025	34
Maturity of Lease Liabilities, Operating, After 2025	756
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	997
Present value adjustment, Operating	(427)
Operating lease liability	570
Maturity of Lease Liabilities, Finance, 2021	36
Maturity of Lease Liabilities, Finance, 2022	34
Maturity of Lease Liabilities, Finance, 2023	31
Maturity of Lease Liabilities, Finance, 2024	29
Maturity of Lease Liabilities, Finance, 2025	21
Maturity of Lease Liabilities, Finance, After 2025	14
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	165
Present value adjustment, Finance	(25)
Present value of lease liabilities, Finance	140
Virginia Electric and Power Company
Lessee Lease Disclosure [Line Items]
Maturity of Lease Liabilities, Operating, 2021	31
Maturity of Lease Liabilities, Operating, 2022	25
Maturity of Lease Liabilities, Operating, 2023	20
Maturity of Lease Liabilities, Operating, 2024	15
Maturity of Lease Liabilities, Operating, 2025	11
Maturity of Lease Liabilities, Operating, After 2025	194
Maturity of Lease Liabilities, Operating, Total undiscounted lease payments	296
Present value adjustment, Operating	(113)
Operating lease liability	183
Maturity of Lease Liabilities, Finance, 2021	9
Maturity of Lease Liabilities, Finance, 2022	8
Maturity of Lease Liabilities, Finance, 2023	8
Maturity of Lease Liabilities, Finance, 2024	7
Maturity of Lease Liabilities, Finance, 2025	6
Maturity of Lease Liabilities, Finance, After 2025	9
Maturity of Lease Liabilities, Finance, Total undiscounted lease payments	47
Present value adjustment, Finance	(3)
Present value of lease liabilities, Finance	$ 44

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 http://asc.fasb.org/extlink&oid=121609121&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 http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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

+ References

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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).

+ 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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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.

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

+ References

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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).

+ 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).

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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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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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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 http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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