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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Regulatory Assets [Line Items]    
Regulatory assets-current $ 879 $ 496
Regulatory assets-noncurrent 7,687 2,676
Total regulatory assets $ 8,566 3,172
SCANA    
Regulatory Assets [Line Items]    
Electric service customers over period 20 years  
DESC    
Regulatory Assets [Line Items]    
Debt issuance costs $ 270  
Weighted Average    
Regulatory Assets [Line Items]    
Weighted average useful life 27 years  
Deferred cost of fuel used in electric generation    
Regulatory Assets [Line Items]    
Regulatory assets-current [1] $ 48 174
Regulatory assets-noncurrent [1]   83
Unrecognized pension and other postretirement benefit costs    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [2] 1,431 1,497
Deferred project costs and DSM programs for gas utilities    
Regulatory Assets [Line Items]    
Regulatory assets-current [3] 21 17
Unrecovered gas costs    
Regulatory Assets [Line Items]    
Regulatory assets-current [4] 102 14
Deferred rate adjustment clause costs    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [5],[6],[7] 235 230
Deferred rate adjustment clause costs for Virginia electric utility    
Regulatory Assets [Line Items]    
Regulatory assets-current [5],[7] 109 78
Deferred nuclear refueling outage costs    
Regulatory Assets [Line Items]    
Regulatory assets-current [8] 68 69
NND Project costs    
Regulatory Assets [Line Items]    
Regulatory assets-current [9] 138  
Regulatory assets-noncurrent [9] 2,503  
PJM transmission rates    
Regulatory Assets [Line Items]    
Regulatory assets-current [10] 121 45
Regulatory assets-noncurrent [10] 85 192
Deferred project costs for gas utilities    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [3] 521 335
Interest rate hedges    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [11] $ 741 184
Interest rate hedges | Weighted Average    
Regulatory Assets [Line Items]    
Weighted average useful life 30 years  
AROs and related funding    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [12] $ 311  
Amortization period for deferred costs 105 years  
Cost of reacquired debt    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [13],[14] $ 262 3
Amortization period for deferred costs 26 years  
Ash pond and landfill closure costs    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [15] $ 1,016 27
Regulatory assets expected collection period commencing year 2021  
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 | Maximum    
Regulatory Assets [Line Items]    
Regulatory assets, amounts expected collection period 18 years  
Other    
Regulatory Assets [Line Items]    
Regulatory assets-current $ 272 99
Regulatory assets-noncurrent $ 582 125
Deferred Project Costs | Maximum    
Regulatory Assets [Line Items]    
Amortization period for deferred costs 18 months  
Virginia Electric and Power Company    
Regulatory Assets [Line Items]    
Regulatory assets-current $ 433 424
Regulatory assets-noncurrent 1,863 737
Total regulatory assets 2,296 1,161
Excess deferred taxes adjusted in charge of operating revenue 29  
Excess deferred taxes adjusted in charge of operating revenue net of tax 22  
Write off of regulatory asset 17  
Write off of regulatory asset, after tax $ 13  
Virginia Electric and Power Company | Weighted Average    
Regulatory Assets [Line Items]    
Weighted average useful life 24 years  
Virginia Electric and Power Company | Deferred cost of fuel used in electric generation    
Regulatory Assets [Line Items]    
Regulatory assets-current [16] $ 48 174
Regulatory assets-noncurrent [16]   83
Virginia Electric and Power Company | Deferred rate adjustment clause costs    
Regulatory Assets [Line Items]    
Regulatory assets-current [17],[18] 109 78
Regulatory assets-noncurrent [17],[18],[19] 235 230
Virginia Electric and Power Company | Deferred nuclear refueling outage costs    
Regulatory Assets [Line Items]    
Regulatory assets-current [20] 68 69
Virginia Electric and Power Company | PJM transmission rates    
Regulatory Assets [Line Items]    
Regulatory assets-current [21] 121 45
Regulatory assets-noncurrent [21] 85 192
Virginia Electric and Power Company | Interest rate hedges    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [22] 404 151
Virginia Electric and Power Company | Ash pond and landfill closure costs    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [23] $ 1,016 27
Regulatory assets expected collection period commencing year 2021  
Virginia Electric and Power Company | Ash pond and landfill closure costs | Minimum    
Regulatory Assets [Line Items]    
Regulatory assets, amounts expected collection period 15 years  
Virginia Electric and Power Company | Ash pond and landfill closure costs | Maximum    
Regulatory Assets [Line Items]    
Regulatory assets, amounts expected collection period 18 years  
Virginia Electric and Power Company | Other    
Regulatory Assets [Line Items]    
Regulatory assets-current $ 87 58
Regulatory assets-noncurrent $ 123 54
Virginia Electric and Power Company | Deferred Project Costs | Maximum    
Regulatory Assets [Line Items]    
Amortization period for deferred costs 18 years  
Dominion Energy Gas Holdings, LLC    
Regulatory Assets [Line Items]    
Regulatory assets-current [24] $ 8 8
Regulatory assets-noncurrent 40 52
Total regulatory assets 48 60
Dominion Energy Gas Holdings, LLC | Unrecognized pension and other postretirement benefit costs    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [25]   15
Dominion Energy Gas Holdings, LLC | Unrecovered gas costs    
Regulatory Assets [Line Items]    
Regulatory assets-current [26] 2 1
Dominion Energy Gas Holdings, LLC | Interest rate hedges    
Regulatory Assets [Line Items]    
Regulatory assets-noncurrent [27] 32 33
Dominion Energy Gas Holdings, LLC | Other    
Regulatory Assets [Line Items]    
Regulatory assets-current 6 7
Regulatory assets-noncurrent $ 8 $ 4
[1] Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations.
[2] 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.
[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 rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) charge in operating revenue in the Consolidated Statements of Income for amounts which are probable of being returned to customers.
[6] During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) to write-off the balance of a regulatory asset for which it is no longer seeking recovery.
[7] 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 income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information.
[8] 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.
[9] 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.
[10] 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.
[11] 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, 2019.
[12] 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 106 years.
[13] 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, 2019.
[14] During 2019, DESC purchased certain of its first mortgage bonds as discussed in Note 18. As a result of these transactions, DESC incurred net costs, including write-offs of unamortized discount, premium and debt issuance costs, of $270 million.
[15] 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 23 for additional information.
[16] Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations.
[17] 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 rate adjustment clauses, Virginia Power recorded a $29 million ($22 million after-tax) charge in operating revenue in the Consolidated Statements of Income for amounts which are probable of being returned to customers.
[18] 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 income taxes refundable from the 2017 Tax Reform Act for Virginia Power. See Note 13 for more information.
[19] During 2019, Virginia Power recorded a charge of $17 million ($13 million after-tax) to write-off the balance of a regulatory asset for which it is no longer seeking recovery.
[20] 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.
[21] 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.
[22] 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 24 years as of December 31, 2019.
[23] 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 23 for additional information.
[24] Current regulatory assets are presented in other current assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[25] 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 Gas’ rate-regulated subsidiaries.
[26] Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority.
[27] 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 30 years.