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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current |  |  |  | $ 699 | $ 871
Regulatory assets-noncurrent |  |  |  | 9,133 | 7,652
Total regulatory assets |  |  |  | $ 9,832 | 8,523
SCANA |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Electric service customers over period |  |  |  | 20 years |
Weighted Average |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Weighted average useful life |  |  |  | 27 years |
Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current |  |  |  | $ 295 | 433
Regulatory assets-noncurrent |  |  |  | 3,509 | 1,863
Total regulatory assets |  |  |  | 3,804 | 2,296
Excess deferred taxes adjusted in charge of operating revenue |  |  |  | 29 | 29
Excess deferred taxes adjusted in charge of operating revenue net of tax |  |  |  | $ 22 | 22
Write off of regulatory asset |  | $ 16 | $ 17 |  |
Write off of regulatory asset, after tax |  | $ 15 | $ 13 |  |
Virginia Electric and Power Company | Weighted Average |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Weighted average useful life |  |  |  | 25 years |
Deferred cost of fuel used in electric generation |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [1] |  |  |  | 48
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [2] |  |  |  | 48
Deferred project costs and DSM programs for gas utilities |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [3] |  |  | $ 35 | 21
Unrecovered Gas Costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [4] |  |  | 78 | 99
Deferred rider costs for Virginia electric utility |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [5],[6] |  |  | 98 | 109
Regulatory assets-noncurrent | [5],[6],[7],[8] |  |  | 311 | 235
Deferred Nuclear Refueling Outage Costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [9] |  |  | 53 | 68
Deferred Nuclear Refueling Outage Costs | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [9] |  |  | 53 | 68
NND Project Costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [10] |  |  | 138 | 138
Regulatory assets-noncurrent | [10] |  |  | 2,364 | 2,503
PJM transmission rates |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [11] |  |  | 71 | 121
Regulatory assets-noncurrent | [11] |  |  | 46 | 85
PJM transmission rates | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [11] |  |  | 71 | 121
Regulatory assets-noncurrent | [11] |  |  | 46 | 85
Other |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current |  |  |  | 226 | 267
Regulatory assets-noncurrent |  |  |  | 498 | 579
Other | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current |  |  |  | 73 | 87
Regulatory assets-noncurrent |  |  |  | 118 | 123
Pension and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [12] |  |  | 1,363 | 1,431
Deferred Project Costs For Gas Utilities |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [3] |  |  | 632 | 521
Interest rate hedges |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [13] |  |  | 1,042 | 709
Interest rate hedges | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [14] |  |  | 733 | 404
AROs and related funding |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [15] |  |  | $ 331 | 311
Amortization period for deferred costs |  |  |  | 105 years |
Cost of reacquired debt |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [16] |  |  | $ 245 | 262
Amortization period for deferred costs |  |  |  | 26 years |
Ash pond and landfill closure costs |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [17] |  |  | $ 2,301 | 1,016
Regulatory assets expected collection period commencing year |  |  |  | 2021 |
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 | Minimum |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets amounts expected collection period |  |  |  | 15 years |
Ash pond and landfill closure costs | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-noncurrent | [18] |  |  | $ 2,301 | 1,016
Regulatory assets expected collection period commencing year |  |  |  | 2021 |
Ash pond and landfill closure costs | Virginia Electric and Power Company | Maximum |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets amounts expected collection period |  |  |  | 18 years |
Ash pond and landfill closure costs | Virginia Electric and Power Company | Minimum |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets amounts expected collection period |  |  |  | 15 years |
Deferred Project Costs | Maximum |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Amortization period for deferred costs |  |  |  | 18 months |
Deferred Project Costs | Virginia Electric and Power Company | Maximum |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Amortization period for deferred costs |  |  |  | 18 months |
Transmission Rate Design For Allocation of Costs of Service | FERC-regulated |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Duration of payment under settlement agreement |  |  |  | 10 years |
Transmission Rate Design For Allocation of Costs of Service | Virginia Electric and Power Company | FERC-regulated |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Duration of payment under settlement agreement |  |  |  | 10 years |
Deferred rider costs | Virginia Electric and Power Company |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets-current | [5],[6] |  |  | $ 98 | 109
Regulatory assets-noncurrent | [5],[7],[8],[19] |  |  | $ 311 | $ 235
[1] | Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations.
[2] | Reflects deferred fuel expenses for Virginia and North Carolina jurisdictions of Virginia Power’s generation operations
[3] | Primarily reflects amounts expected to be collected from or owed to gas customers in Dominion Energy’s service territories associated with current and prospective rider projects, including CEP, PIR and pipeline integrity management. See Note 13 for more information
[4] | Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority
[5] | As a result of actions from the Virginia Commission in the first quarter of 2019 regarding the ratemaking treatment of excess deferred taxes from the adoption of the 2017 Tax Reform Act for all existing riders, Virginia Power recorded a $29 million ($22 million after-tax) charge in operating revenue in the Consolidated Statements of Income for amounts probable of being returned to customers primarily in 2019 and 2020.
[6] | Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of excess deferred income taxes from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information
[7] | During the first quarter of 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) in impairment of assets and other charges (reflected in the Corporate and Other segment) to write-off the balance of a regulatory asset for which it is no longer seeking recovery
[8] | During the second quarter of 2020, Virginia Power recorded a charge of $16 million ($15 million after-tax) in impairment of assets and other charges (reflected in the Corporate and Other segment) to write off the balance of a regulatory asset for which it is no longer seeking recovery
[9] | Legislation enacted in Virginia in April 2014 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
[10] | 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. See Note 3 for more information
[11] | Reflects amounts to be recovered through retail rates in Virginia for payments Virginia Power will make to PJM over a ten-year period ending 2028 under the terms of a FERC settlement agreement in May 2018 resolving a PJM cost allocation matter
[12] | 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
[13] | 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 27 years as of December 31, 2020
[14] | 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 as of December 31, 2020
[15] | 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
[16] | Costs of the reacquisition of debt are deferred and amortized as interest expense over the would-be remaining life of the reacquired debt. The reacquired debt costs had a weighted-average life of approximately 26 years as of December 31, 2020
[17] | Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCRs to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 14 for additional information. As a result of the March 2020 planned early retirement of certain facilities, amounts recoverable through riders were reclassified from property, plant and equipment
[18] | Primarily reflects legislation enacted in Virginia in March 2019 which requires any CCR unit located at certain Virginia Power stations to be closed by removing the CCR to an approved landfill or through recycling for beneficial reuse. Subject to approval by the Virginia Commission, amounts are expected to be collected over a period between 15 and 18 years commencing no earlier than 2021. Virginia Power is entitled to collect carrying costs once expenditures have been made. See Note 14 for additional information. As a result of the March 2020 planned early retirement of certain facilities, amounts recoverable through riders were reclassified from property, plant and equipment
[19] | Reflects deferrals under Virginia Power’s electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects, net of excess deferred income taxes from the 2017 Tax Reform Act. See Note 13 for more information

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