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Significant Accounting Policies (Schedule of Increase (Decrease) to Each Affected Line Item in Companies' Consolidated Financial Statements) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Other income (expense)                 $ 822 $ 984 $ (117)
Income tax expense                 308 [1] 568 [2] 59 [3]
Net income from continuing operations                 1,927 2,156 269 [4]
Net income (loss) from discontinued operations                 $ 197 $ (125) $ 922 [4]
Earnings per share $ 0.15 $ 1.12 $ 0.66 $ 0.50 $ 0.37 $ 0.16 $ 0.66 $ 1.14 $ 2.44 $ 2.33 $ 1.33 [4]
Change In Method of Accounting for Employee Benefit Plan Market-Related Impacts                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Other income (expense) [5]                 $ (359) $ (8) $ (226)
Income tax expense [5]                 (93) (7) (57)
Net income from continuing operations [5],[6]                 $ (266) $ (1) (169)
Net income (loss) from discontinued operations [5]                     $ 28
Earnings per share [5]                 $ (0.32)   $ (0.17)
[1] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[2] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[3] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[4] As discussed in Note 19, effective in June 2022 through its redemption in September 2022, the Series A Preferred Stock was considered to be mandatorily redeemable and was classified in current liabilities.
[5] Excludes the impacts associated with the impairment of goodwill associated with the Questar Transaction previously recorded in 2023 and gain on sale of Hope in 2022. Such amounts are an $18 million and $38 million increase in net income from discontinued operations with a corresponding $0.02 and $0.04 increase in earnings per share, for the years ended December 31, 2024 and 2023, respectively, and a $14 decrease in loss on sales of assets, a $3 million increase in income tax expense and an $11 million increase in net income from continuing operations, resulting in a $0.01 increase in earnings per share for the year ended December 31, 2022. Such amounts include the impact on deferred income taxes of $10 million in 2023 related to an increase in the deferred taxes on the outside basis of Questar Gas, Wexpro and related affiliates’ stock, which reversed in 2024 upon closing of the Questar Gas Transaction. The impact to Dominion Energy's net income (loss) from discontinued operations includes an increase (decrease) of $4 million ($— per share), $16 million ($0.02 per share), $(2) million ($— per share) and $— million ($— per share) for the first, second, third and fourth quarters of 2024, respectively.
[6] The impact to Dominion Energy's net income from continuing operations includes an increase (decrease) of $(237) million ($(0.28) per share), $(8) million ($(0.01) per share), $6 million ($0.01 per share) and $(27) million ($(0.03) per share) for the first, second, third and fourth quarters of 2024, respectively.