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Leases (Scheduled Maturities of Lease Liabilities) (Detail) $ in Millions | Dec. 31, 2020 USD ($)
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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

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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 -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 + Details
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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 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 + Details
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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 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 + Details
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- Definition 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 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 + Details
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- Definition 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 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 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for 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 + Details
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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 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 + Details
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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 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 + Details
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