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Leases - (Summary of Total Lease Cost) (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Lessee Lease Disclosure [Line Items] |  |  |  |
Finance lease cost, Amortization | [1] | $ 41 | $ 40 | $ 33
Finance lease cost, Interest | [2] | 3 | (3) |
Operating lease cost | [3] | 53 | 66 | 68
Short-term lease cost | [4] | 31 | 32 | 20
Discontinued Operations |  |  |  |
Lessee Lease Disclosure [Line Items] |  |  |  |
Finance lease cost, Amortization |  | 3 | 3 | 2
Finance lease cost, Interest |  | 1 | 1 |
Operating lease cost |  | 6 | 8 | 8
Short-term lease cost |  | $ 2 | $ 2 | $ 1
[1] | Dominion Energy includes $3 million, $3 million and $2 million for the years ended December 31, 2022, 2021 and 2020, respectively, in discontinued operations in its Consolidated Statements of Income.
[2] | Dominion Energy includes $1 million for the year ended December 31, 2022 and less than $1 million for the years ended December 31, 2021 and 2020, respectively, in discontinued operations in its Consolidated Statements of Income.
[3] | Dominion Energy includes $6 million, $8 million and $8 million for the years ended December 31, 2022, 2021 and 2020, respectively, in discontinued operations in its Consolidated Statements of Income.
[4] | Dominion Energy includes $2 million, $2 million and $1 million for the years ended December 31, 2022, 2021 and 2020, respectively, in discontinued operations in its Consolidated Statements of Income.

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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. + 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 45 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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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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- Definition Amount of short-term lease cost, excluding expense for lease with term of one month or less. + 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 (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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