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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current $ 1,059 $ 809 [1]
Regulatory liabilities-noncurrent 10,346 10,187 [1]
Total regulatory liabilities 11,405 10,996
Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current 685 425 [2]
Regulatory liabilities-noncurrent 5,560 5,338 [2]
Total regulatory liabilities 6,245 5,763
Provision for future cost of removal and AROs    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [3] 183 183
Regulatory liabilities-noncurrent [3] 2,321 2,150
Provision for future cost of removal and AROs | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [4] 152 152
Reserve for refunds to electric utility customers    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [5] 422 128
Regulatory liabilities-noncurrent [5] 480 540
Cost-of-service impact of 2017 Tax Reform Act    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [6]   12
Income taxes refundable through future rates    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [7] 140 124
Regulatory liabilities-noncurrent [7] 4,274 4,376
Income taxes refundable through future rates | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [8] 54 54
Regulatory liabilities-noncurrent [8] 2,356 2,404
Deferred cost of fuel used in electric generation    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [9] 1 58
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [10] 1 58
Regulatory liabilities-noncurrent [10]   54
Monetization of guarantee settlement    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [11] 67 67
Regulatory liabilities-noncurrent [11] 848 903
Other    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current 140 108
Regulatory liabilities-noncurrent 368 388
Other | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current 87 33
Regulatory liabilities-noncurrent 173 181
Reserve for future credits to Virginia electric customers    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [12]   120
Reserve for future credits to Virginia electric customers | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [13]   120
Nuclear decommissioning trust    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [14] 1,958 1,719
Nuclear decommissioning trust | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [15] 1,958 1,719
Commodity derivatives    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [16] 106 9
Overrecovered Other Postretirement Benefit Costs    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [17] 97 111
Reserve for refunds to Virginia electric customers | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [12] 299  
Regulatory liabilities-noncurrent [13] 31  
Derivatives | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [16] 92 8
Provision For Future Cost Of Removal | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [4] $ 1,042 $ 980
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.
[3] Rates charged to customers by Dominion Energy’s regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement. Reflects an increase of $66 million associated with the revision of certain gas distribution pipeline AROs in the third quarter of 2021. See Note 2 for more information.
[4] Rates charged to customers by Virginia Power's regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.
[5] Reflects amounts previously collected from retail electric customers of DESC for the NND Project to be credited over an estimated 11-year period effective February 2019, in connection with the SCANA Merger Approval Order. See Notes 3 and 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information. Also reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the proposed settlement of the 2021 Triennial Review.  See Note 13 for additional information.
[6] Balance refundable to customers related to the decrease in revenue requirements for recovery of income taxes at the Companies’ regulated electric generation and electric and natural gas distribution operations. See Notes 3 and 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information.
[7] Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will primarily reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity.
[8] Amounts recorded to pass the effect of reduced income taxes from the 2017 Tax Reform Act to customers in future periods, which will reverse at the weighted average tax rate that was used to build the reserves over the remaining book life of the property, net of amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC equity.
[9] Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations.
[10] Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations.
[11] Reflects amounts to be refunded to DESC electric service customers over a 20-year period ending in 2039 associated with the monetization of a bankruptcy settlement agreement.  See Note 3 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2020 for more information.
[12] Represents a reserve related to the expected use of a CCRO in accordance with the GTSA associated with the 2021 Triennial Review. See Note 13 for additional information. 
[13] Reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the proposed settlement of the 2021 Triennial Review.  See Note 13 for additional information.
[14] Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon, as applicable) for the future decommissioning of Dominion Energy’s utility nuclear generation stations, in excess of the related AROs.
[15] Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon) for the future decommissioning of Virginia Power’s utility nuclear generation stations, in excess of the related AROs. 
[16] For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers.
[17] Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.