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Leases (Summary of Total Lease Cost) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Finance lease cost: |  |  |  |
Finance lease cost, Amortization | [1] | $ 50 | $ 41 | $ 40
Finance lease cost, Interest | [2] | 13 | 3 | (3)
Operating lease cost | [3] | 70 | 53 | 66
Short-term lease cost | [4] | 32 | 31 | 32
Variable lease cost |  | 6 | 4 | 5
Total lease cost |  | 171 | 132 | 140
Virginia Electric and Power Company |  |  |  |
Finance lease cost: |  |  |  |
Finance lease cost, Amortization | [1] | 24 | 15 | 12
Finance lease cost, Interest | [2] | 4 | 3 | 1
Operating lease cost | [3] | 43 | 32 | 30
Short-term lease cost | [4] | 23 | 21 | 19
Variable lease cost |  | 2 | 1 | 1
Total lease cost |  | $ 96 | $ 72 | $ 63
[1] | Dominion Energy includes $3 million for each of the years ended December 31, 2023, 2022 and 2021 reflected in discontinued operations in its Consolidated Statements of Income.
[2] | Dominion Energy includes $1 million for both the years ended December 31, 2023 and 2022 and less than $1 million for the year ended December 31, 2021 reflected in discontinued operations in its Consolidated Statements of Income.
[3] | Dominion Energy includes $5 million, $6 million and $8 million for the years ended December 31, 2023, 2022 and 2021, respectively, reflected in discontinued operations in its Consolidated Statements of Income.
[4] | Dominion Energy includes $2 million for each of the years ended December 31, 2023, 2022 and 2021 reflected in discontinued operations in its Consolidated Statements of Income.

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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