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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current $ 945 $ 986 [1]
Regulatory liabilities-noncurrent 10,100 10,713 [1]
Total regulatory liabilities 11,045 11,699
Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current 537 647 [2]
Regulatory liabilities-noncurrent 5,282 5,740 [2]
Total regulatory liabilities $ 5,819 6,387
SCANA    
Regulatory Liabilities [Line Items]    
Estimation period of collection to be credited 11 years  
Electric service customers over period 20 years  
Provision for future cost of removal and AROs    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [3] $ 181 181
Regulatory liabilities-noncurrent [3] 2,375 2,331
Provision for future cost of removal and AROs | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [4] 154 154
Reserve for refunds and rate credits to electric utility customers    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [5] 145 420
Regulatory liabilities-noncurrent [5] 382 448
Income taxes refundable through future rates    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [6] 150 153
Regulatory liabilities-noncurrent [6] 4,121 4,260
Income taxes refundable through future rates | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [7] 63 63
Regulatory liabilities-noncurrent [7] 2,284 2,335
Monetization of guarantee settlement    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [8] 67 67
Regulatory liabilities-noncurrent [8] $ 736 831
Electric service customers over period 20 years  
Derivative Liabilities    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [9] $ 319 69
Regulatory liabilities-noncurrent [9] 238 169
Derivative Liabilities | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [9] 252 51
Other    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current 83 96
Regulatory liabilities-noncurrent 248 144
Other | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current 31 73
Regulatory liabilities-noncurrent 226 179
Nuclear decommissioning trust    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [10] 1,674 2,158
Nuclear decommissioning trust | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [11] 1,674 2,158
Interest rate hedges    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [12] 21 67
Interest rate hedges | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [13] 21  
Unrecognized Pension and Other Postretirement Benefit Costs    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [14] 183 200
Overrecovered Other Postretirement Benefit Costs    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [15] 122 105
Reserve for refunds to Virginia electric customers | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-current [16] 37 306
Regulatory liabilities-noncurrent [16] 13 25
Provision For Future Cost Of Removal | Virginia Electric and Power Company    
Regulatory Liabilities [Line Items]    
Regulatory liabilities-noncurrent [4] $ 1,064 $ 1,043
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2021 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.
[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, 2021 for additional information. Also reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the settlement of the 2021 Triennial Review. See Note 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2021 for additional information.
[6] 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.
[7] 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.
[8] 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, 2021 for additional information.
[9] 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.
[10] 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.
[11] 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. 
[12] 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 June 30, 2022. 
[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 24 years as of June 30, 2022.
[14] 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.
[15] Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.
[16] Reflects amounts to be refunded to jurisdictional retail electric customers in Virginia associated with the settlement of the 2021 Triennial Review. See Note 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2021 for additional information.