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Asset Retirement Obligations (Changes to AROs) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Asset Retirement Obligations [Line Items]    
AROs, Beginning balance $ 6,075 [1] $ 5,427
Obligations incurred during the period 1,126 [2] 16
Obligations settled during the period (347) (193)
Revisions in estimated cash flows 300 [3] 603 [4]
Accretion 272 222
AROs, Ending balance [1] 7,426 6,075
Virginia Electric and Power Company    
Asset Retirement Obligations [Line Items]    
AROs, Beginning balance 4,653 [1] 4,093
Obligations incurred during the period 469 [2] 9
Obligations settled during the period (259) (169)
Revisions in estimated cash flows 342 [3] 564 [4]
Accretion 192 156
AROs, Ending balance [1] $ 5,397 $ 4,653
[1] Includes $434 million and $352 million reported in other current liabilities for Dominion Energy at December 31, 2023 and 2024, respectively.
[2] Primarily reflects AROs related to CCR remediation as discussed below.
[3] Primarily reflects revisions for increased costs related to the completion of nuclear decommissioning cost studies for Millstone, Surry and North Anna inclusive of a charge of $122 million ($89 million after-tax) within impairment of assets and other charges in Dominion Energy’s Consolidated Statements of Income (reflected in the Corporate and Other segment). In addition, there were downward revisions for CCR remediation costs at Dominion Energy and future ash pond and landfill closure costs of certain electric generation facilities at Virginia Power.
[4] 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).