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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current |  | $ 716 | $ 455 | [1]
Regulatory liabilities-noncurrent |  | 10,170 | 10,204 | [1]
Total regulatory liabilities |  | 10,886 | 10,659 |
Virginia Electric and Power Company |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current |  | 312 | 167 | [2]
Regulatory liabilities-noncurrent |  | 5,324 | 5,074 | [2]
Total regulatory liabilities |  | 5,636 | 5,241 |
Provision for future cost of removal and AROs |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current | [3] | 124 | 124 |
Regulatory liabilities-noncurrent | [3] | 2,183 | 2,208 |
Provision for future cost of removal and AROs | Virginia Electric and Power Company |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current | [4] | 103 | 103 |
Reserve for refunds and rate credits to electric utility customers |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current | [5] | 133 | 143 |
Regulatory liabilities-noncurrent | [5] | 570 | 656 |
Cost-of-service impact of 2017 Tax Reform Act |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current | [6] | 23 | 4 |
Income taxes refundable through future rates |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current | [7] | 135 | 71 |
Regulatory liabilities-noncurrent | [7] | 4,378 | 4,529 |
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] | 2,406 | 2,438 |
Monetization of guarantee settlement |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current | [9] | 67 | 67 |
Regulatory liabilities-noncurrent | [9] | 920 | 970 |
Deferred cost of fuel used in electric generation |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current | [10] | 82 | 0 |
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current | [11] | 82 | 0 |
Regulatory liabilities-noncurrent | [11] | 42 | 30 |
Other |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current |  | 152 | 46 |
Regulatory liabilities-noncurrent |  | 349 | 316 |
Other | Virginia Electric and Power Company |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-current |  | 73 | 10 |
Regulatory liabilities-noncurrent |  | 166 | 81 |
Nuclear decommissioning trust |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-noncurrent | [12] | 1,496 | 1,471 |
Nuclear decommissioning trust | Virginia Electric and Power Company |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-noncurrent | [13] | 1,496 | 1,471 |
Reserve for future credits to Virginia electric customers |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-noncurrent | [14] | 200 |  |
Reserve for future credits to Virginia electric customers | Virginia Electric and Power Company |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-noncurrent | [14] | 200 |  |
Overrecovered Other Postretirement Benefit Costs |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-noncurrent | [15] | 74 | 54 |
Provision For Future Cost Of Removal | Virginia Electric and Power Company |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |
Regulatory liabilities-noncurrent | [4] | $ 1,014 | $ 1,054 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 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, 2019 for more 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, 2019 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 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, 2019 for more information.
[10] | Reflects deferred fuel expenses for the Virginia, North Carolina and South Carolina jurisdictions of Dominion Energy’s electric generation operations.
[11] | Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Virginia Power’s generation operations.
[12] | 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.
[13] | 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.
[14] | Represents a reserve for benefits expected to be provided to retail electric customers in Virginia in connection with the quadrennial review of Virginia Power’s base rates scheduled to occur in 2021. During the third quarter of 2020, Virginia Power recorded a reserve of $200 million reflected in impairment of assets and other charges in its Consolidated Statements of Income for benefits expected to be provided through the use of a customer credit reinvestment offset in accordance with the GTSA. See Note 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2019 for additional information.
[15] | Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.

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