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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | $ 1,883 | $ 1,223
Regulatory assets-noncurrent |  | 8,265 | 7,886
Total regulatory assets |  | 10,148 | 9,109
Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 1,140 | 850
Regulatory assets-noncurrent |  | 4,247 | 4,130
Total regulatory assets |  | $ 5,387 | 4,980
Weighted Average |  |  |
Regulatory Assets [Line Items] |  |  |
Weighted average useful life |  | 25 years |
Weighted Average | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Weighted average useful life |  | 24 years |
SCANA |  |  |
Regulatory Assets [Line Items] |  |  |
Electric service customers over period |  | 20 years |
Deferred cost of fuel used in electric generation |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [1] | $ 603 | 251
Regulatory assets-noncurrent | [1] | 1,551 | 409
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [1] | 133 | 131
Regulatory assets-noncurrent | [1] | 1,551 | 409
Deferred rider costs for Virginia electric utility |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [2] | 152 | 72
Regulatory assets-noncurrent | [2] | 363 | 489
Deferred rider costs for Virginia electric utility | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [2] | 152 | 72
Regulatory assets-noncurrent | [2] | 363 | 489
Ashpond and landfill closure costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [3] | 221 | 193
Regulatory assets-noncurrent | [3] | $ 2,051 | 2,223
Regulatory assets expected collection period commencing year |  | 2021 |
Ashpond and landfill closure costs | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [3] | $ 221 | 193
Regulatory assets-noncurrent | [3] | $ 2,049 | 2,223
Regulatory assets expected collection period commencing year |  | 2021 |
Deferred Nuclear Refueling Outage Costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [4] | $ 83 | 79
Deferred Nuclear Refueling Outage Costs | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [4] | 83 | 79
NND Project Costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [5] | 138 | 138
Regulatory assets-noncurrent | [5] | 2,088 | 2,226
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent | [6] | 891 | 488
Total regulatory assets |  | 302 | 25
Unrecognized Pension and Other Postretirement Benefit Costs | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent | [6] | 4 | 3
Interest rate hedges |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent | [7] | 169 | 899
Interest rate hedges | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent | [7] | 0 | 604
AROs and related funding |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent | [8] | $ 380 | 311
Amortization period for deferred costs |  | 105 years |
Ash pond and landfill closure costs | Minimum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets amounts expected collection period |  | 15 years |
Ash pond and landfill closure costs | Minimum | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets amounts expected collection period |  | 15 years |
Ash pond and landfill closure costs | Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets amounts expected collection period |  | 18 years |
Ash pond and landfill closure costs | Maximum | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets amounts expected collection period |  | 18 years |
Deferred early plant retirement charges |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [9] | $ 226 | 226
Regulatory assets-noncurrent | [9] | 0 | 226
Deferred early plant retirement charges | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [9] | 226 | 226
Regulatory assets-noncurrent | [9] | 0 | 226
Derivatives |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [10] | 256 | 112
Regulatory assets-noncurrent | [10] | 254 | 34
Derivatives | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [10] | 251 | 105
Regulatory assets-noncurrent | [10] | 148 | 34
Other |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 204 | 152
Regulatory assets-noncurrent |  | 518 | 581
Other | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 74 | 44
Regulatory assets-noncurrent |  | $ 132 | $ 142
Deferred Project Costs | Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Amortization period for deferred costs |  | 18 months |
Deferred Project Costs | Maximum | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Amortization period for deferred costs |  | 18 months |
[1] | Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power's electric generation operations and additionally for Dominion Energy, deferred fuel expenses for the South Carolina jurisdiction of its electric generation operations. Dominion Energy reflects a $66 million reduction recorded in 2022 from the application of a portion of the monetization of guarantee settlement previously reflected as regulatory liabilities associated with the approval of DESC’s cost of fuel proceedings. See Note 13 for additional information.
[2] | Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects. See Note 13 for additional information.
[3] | Primarily reflects legislation in Virginia which requires any CCR asset located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through beneficial reuse. These deferred costs are expected to be collected over a period between 15 and 18 years commencing December 2021 through Rider CCR. Virginia Power is entitled to collect carrying costs on uncollected expenditures once expenditures have been made.
[4] | Legislation in Virginia requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months.
[5] | Reflects expenditures by DESC associated with the NND Project, which pursuant to the SCANA Merger Approval Order, will be recovered from DESC electric service customers over a 20-year period ending in 2039.
[6] | Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered or refunded through future rates generally over the expected remaining service period of plan participants by certain of Dominion Energy's rate-regulated subsidiaries. Includes regulatory assets of $302 million and $25 million and regulatory liabilities of $6 million and $20 million in aggregate at December 31, 2022 and 2021, respectively, related to retained pension and other postretirement benefit plan assets and obligations for the East Ohio, PSNC and Questar Gas Transactions which will be reclassified to AOCI upon closing of each transaction.
[7] | Reflects interest rate hedges recoverable from or refundable to customers. Certain of these instruments are settled and any related payments are being amortized into interest expense over the life of the related debt, which has a weighted-average useful life of approximately 25 years and 24 years for Dominion Energy and Virginia Power, respectively, as of December 31, 2022.
[8] | Represents deferred depreciation and accretion expense related to legal obligations associated with the future retirement of generation, transmission and distribution properties. The AROs primarily relate to DESC’s electric generating facilities, including Summer, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 105 years.
[9] | Reflects amounts from the early retirements of certain coal- and oil-fired generating units to be amortized through 2023 in accordance with the settlement of the 2021 Triennial Review. See Note 13 for additional information.
[10] | Represents changes in the fair value of derivatives, excluding separately presented interest rate hedges, that following settlement are expected to be recovered from or refunded to customers.

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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