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Asset Retirement Obligations (Changes to AROs) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Asset Retirement Obligations [Line Items]    
AROs, Beginning balance $ 5,427 [1] $ 5,333
Obligations incurred during the period 16 138
Obligations settled during the period (193) (125)
Revisions in estimated cash flows 603 [2] 46 [3]
Accretion 222 210
Sales of Kewaunee and Hope   (175)
AROs, Ending balance 6,075 5,427 [1]
Virginia Electric and Power Company    
Asset Retirement Obligations [Line Items]    
AROs, Beginning balance 4,093 [1] 3,923
Obligations incurred during the period 9 132
Obligations settled during the period (169) (155)
Revisions in estimated cash flows 564 [2] 48 [3]
Accretion 156 145
AROs, Ending balance $ 4,653 $ 4,093 [1]
[1] Includes $365 million and $434 million reported in other current liabilities for Dominion Energy at December 31, 2022 and 2023, respectively.
[2] Primarily reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities at Virginia Power as discussed below. In addition, Dominion Energy recorded a $48 million increase to its AROs to reflect a revision in the estimated cash flows following the approval of closure plans for a DESC generation facility previously taken out of service. Dominion Energy also recorded a decrease of $125 million to its AROs due to a revision in the timing of expected cash flows associated with the expected approval of a 20-year useful life extension of Millstone Units 2 and 3. Concurrently, Dominion Energy reevaluated its estimated cash flows associated with Millstone Unit 1, which resulted in an increase to its AROs of $83 million. As a result, Dominion Energy recorded a charge of $83 million ($60 million after-tax) within impairment of assets and other charges in its Consolidated Statements of Income (reflected in the Corporate and Other segment).
[3] Primarily reflects revisions to asbestos abatement costs associated with the early retirement of certain retired electric generation facilities.