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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Regulatory Assets [Line Items]      
Regulatory assets-current   $ 745 $ 496 [1]
Regulatory assets-noncurrent   7,563 2,676 [1]
Total regulatory assets   $ 8,308 3,172
Weighted Average      
Regulatory Assets [Line Items]      
Weighted average useful life   26 years  
SCANA      
Regulatory Assets [Line Items]      
Electric service customers over period   20 years  
DESC      
Regulatory Assets [Line Items]      
Repurchase of first mortgage bonds $ 1,200    
Debt issuance costs 187    
Virginia Electric and Power Company      
Regulatory Assets [Line Items]      
Regulatory assets-current [2]   $ 343 424
Regulatory assets-noncurrent   1,872 737 [3]
Total regulatory assets   2,215 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 17  
Write off of regulatory asset, after tax $ 13 $ 13  
Virginia Electric and Power Company | Weighted Average      
Regulatory Assets [Line Items]      
Weighted average useful life   22 years  
Dominion Energy Gas Holdings, LLC      
Regulatory Assets [Line Items]      
Regulatory assets-current [4]   $ 9 8
Regulatory assets-noncurrent [5]   43 52
Total regulatory assets   52 60
Regulatory assets not expect to earn return      
Regulatory Assets [Line Items]      
Regulatory assets-current [6]   124 174
Regulatory assets-noncurrent [6]   1 83
Regulatory assets not expect to earn return | Virginia Electric and Power Company      
Regulatory Assets [Line Items]      
Regulatory assets-current [7]   111 174
Regulatory assets-noncurrent [7]   1 83
Deferred project costs and DSM programs for gas utilities      
Regulatory Assets [Line Items]      
Regulatory assets-current [8]   64 17
Unrecovered gas costs      
Regulatory Assets [Line Items]      
Regulatory assets-current [9]   55 14
Unrecovered gas costs | Dominion Energy Gas Holdings, LLC      
Regulatory Assets [Line Items]      
Regulatory assets-current [9]   1 1
Deferred rate adjustment clause costs for Virginia electric utility      
Regulatory Assets [Line Items]      
Regulatory assets-current [10],[11]   56 78
Regulatory assets-noncurrent [10],[11],[12]   278 230
Deferred rate adjustment clause costs for Virginia electric utility | Virginia Electric and Power Company      
Regulatory Assets [Line Items]      
Regulatory assets-current [10],[11]   56 78
Regulatory assets-noncurrent [10],[11],[12]   278 230
Deferred nuclear refueling outage costs      
Regulatory Assets [Line Items]      
Regulatory assets-current [13]   56 69
Deferred nuclear refueling outage costs | Virginia Electric and Power Company      
Regulatory Assets [Line Items]      
Regulatory assets-current [13]   56 69
PJM transmission rates      
Regulatory Assets [Line Items]      
Regulatory assets-current [14]   69 45
Regulatory assets-noncurrent [14]   169 192
PJM transmission rates | Virginia Electric and Power Company      
Regulatory Assets [Line Items]      
Regulatory assets-current   69 45
Regulatory assets-noncurrent [14]   169 192
Other      
Regulatory Assets [Line Items]      
Regulatory assets-current   183 99
Regulatory assets-noncurrent   515 125
Other | Virginia Electric and Power Company      
Regulatory Assets [Line Items]      
Regulatory assets-current   51 58
Regulatory assets-noncurrent   89 54
Other | Dominion Energy Gas Holdings, LLC      
Regulatory Assets [Line Items]      
Regulatory assets-current   8 7
Regulatory assets-noncurrent   7 4
NND Project Costs      
Regulatory Assets [Line Items]      
Regulatory assets-current [15]   138  
Regulatory assets-noncurrent [15]   2,572  
Unrecognized pension and other postretirement benefit costs      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [16]   1,360 1,497
Unrecognized pension and other postretirement benefit costs | Dominion Energy Gas Holdings, LLC      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [17]   4 15
Deferred project costs for gas utilities      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [8]   451 335
Interest rate hedges      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [18]   706 184
Interest rate hedges | Virginia Electric and Power Company      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [19]   367 151
Interest rate hedges | Dominion Energy Gas Holdings, LLC      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [20]   32 33
AROs and related funding      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [21]   $ 340  
Amortization period for deferred costs   106 years  
Cost of reacquired debt      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [22],[23]   $ 203 3
Amortization period for deferred costs   30 years  
Ash pond and landfill closure costs      
Regulatory Assets [Line Items]      
Regulatory assets-noncurrent [24]   $ 968 27
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 [25]   $ 968 $ 27
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  
Cost of reacquired debt      
Regulatory Assets [Line Items]      
Amortization period for deferred costs   30 years  
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Current regulatory assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[4] Current regulatory assets are presented in other current assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[5] Noncurrent regulatory assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[6] Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations.
[7] Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations.
[8] 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.
[9] Reflects unrecovered or overrecovered gas costs at regulated gas operations, which are recovered or refunded through filings with the applicable regulatory authority.
[10] 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.
[11] 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
[12] During the first quarter of 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.
[13] 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.
[14] 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. 13
[15] 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.
[16] 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.
[17] 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.
[18] 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 26 years.
[19] 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 22 years.
[20] 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.
[21] 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 V.C. Summer nuclear power station, and are expected to be recovered over the related property lives and periods of decommissioning which may range up to approximately 106 years.
[22] 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 30 years as of June 30, 2019.
[23] In March 2019, DESC purchased certain of its first mortgage bonds having an aggregate purchase price of $1.2 billion, as discussed in Note 17. As a result of this transaction, Dominion Energy incurred costs, including write-off of unamortized discount, premium, and debt issuance costs, of $187 million.
[24] 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. See Note 18 for additional information.
[25] 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. See Note 18 for additional information.