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Employee Benefit Plans (Narrative) (Detail) - USD ($) shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2020
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Accumulated benefit obligation |  | $ 9,700,000,000 |  |  | $ 9,700,000,000 | $ 7,800,000,000 |  |
Contributions to qualified defined benefit pension plans |  |  |  |  | 499,000,000 |  |  |
Contributions to qualified defined benefit pension plans, shares |  | 6.1 |  |  |  |  |  |
Contributions to qualified defined benefit pension plans in 2020 |  | $ 29,000,000 |  |  | 29,000,000 |  |  |
Contribution to voluntary employees beneficiary association |  |  |  |  | 12,000,000 |  |  |
Defined contribution plan, employer matching contributions |  |  |  |  | $ 73,000,000 | 51,000,000 | $ 45,000,000 |
Common Stock |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Contributions to qualified defined benefit pension plans |  | $ 499,000,000 |  |  |  |  |  |
Common and Preferred Stocks |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 28.00% |  |  | 28.00% |  |  |
Non-U.S.Equity |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 18.00% |  |  | 18.00% |  |  |
Fixed Income |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 35.00% |  |  | 35.00% |  |  |
Real Estate Funds |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 3.00% |  |  | 3.00% |  |  |
Other Alternative Investments |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  | 16.00% |  |  | 16.00% |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Pension or other postretirement plan assets to be returned |  |  |  |  |  |  |  | $ 0
Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  | $ 1,747,000,000 | (513,000,000) |  |
Expected return on pension and other postretirement plan assets |  |  |  |  | 708,000,000 | 663,000,000 | 639,000,000 |
Net periodic benefit cost (credit) |  |  |  |  | $ 93,000,000 | $ 25,000,000 | 7,000,000 |
Increase in fair value of plan assets |  |  | $ 51,000,000 | $ 671,000,000 |  |  |  |
Discount rate percentage |  | 3.63% |  |  | 3.63% | 4.42% |  |
Contributions to qualified defined benefit pension plans |  | $ 520,000,000 |  |  | $ 557,000,000 | $ 6,000,000 |  |
Pension Benefits | Minimum |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Discount rate percentage |  | 3.47% |  | 4.07% | 3.47% | 4.42% |  |
Pension Benefits | Maximum |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Discount rate percentage |  | 3.63% |  | 4.10% | 3.63% | 4.43% |  |
Other Postretirement Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  | $ 349,000,000 | $ (92,000,000) |  |
Expected return on pension and other postretirement plan assets |  |  |  |  | 140,000,000 | 143,000,000 | 128,000,000 |
Net periodic benefit cost (credit) |  |  |  |  | $ (46,000,000) | $ (101,000,000) | (80,000,000) |
Increase in fair value of plan assets |  |  |  | $ 156,000,000 |  |  |  |
Discount rate percentage |  | 3.44% |  |  | 3.44% | 4.37% |  |
Contributions to qualified defined benefit pension plans |  |  |  |  | $ 12,000,000 | $ 12,000,000 |  |
Other Postretirement Benefits | Minimum |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Discount rate percentage |  | 3.44% |  | 4.05% | 3.44% | 4.37% |  |
Other Postretirement Benefits | Maximum |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Discount rate percentage |  | 3.52% |  | 4.08% | 3.52% | 4.38% |  |
Voluntary Retirement Program |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | $ 427,000,000 |  |  |  |
Voluntary retirement program related charges net of tax |  |  |  | 319,000,000 |  |  |  |
Remeasurement resulted in increase in pension benefit obligation |  |  | $ 37,000,000 | 484,000,000 |  |  |  |
Increase in accumulated postretirement benefit obligation |  |  |  | 101,000,000 |  |  |  |
Discount rate percentage |  |  | 3.57% |  |  |  |  |
Voluntary Retirement Program | Other operations and maintenance |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 291,000,000 |  |  |  |
Voluntary Retirement Program | Other Taxes |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 24,000,000 |  |  |  |
Voluntary Retirement Program | Other Income |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 112,000,000 |  |  |  |
Pension Plans and Post Retirement Benefit Plan |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  | $ 2,100,000 | $ (605,000,000) |  |
Expected return on pension and other postretirement plan assets |  |  |  |  | 848,000,000 | 806,000,000 |  |
Voluntary Employees Beneficiary Association |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Contributions to qualified defined benefit pension plans in 2020 |  | $ 12,000,000 |  |  | 12,000,000 |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Accumulated benefit obligation |  | 279,000,000 |  |  | 279,000,000 | 689,000,000 |  |
Contributions to qualified defined benefit pension plans |  | 0 |  |  |  |  |  |
Contributions to qualified defined benefit pension plans in 2020 |  | $ 0 |  |  | 0 |  |  |
Defined contribution plan, employer matching contributions |  |  |  |  | 4,000,000 | 8,000,000 | 8,000,000 |
Dominion Energy Gas Holdings, LLC | Other operations and maintenance | Dominion Energy Retiree Health And Welfare Plan [Member] | Multiemployer Plans, Postretirement Benefit |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  | (4,000,000) | (8,000,000) | (6,000,000) |
Dominion Energy Gas Holdings, LLC | Net income from discontinued operations | Dominion Energy Retiree Health And Welfare Plan [Member] | Multiemployer Plans, Postretirement Benefit |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  | (1,000,000) | (2,000,000) | (2,000,000) |
Dominion Energy Gas Holdings, LLC | Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  | 129,000,000 | (113,000,000) |  |
Expected return on pension and other postretirement plan assets |  |  |  |  | 54,000,000 | 150,000,000 | 141,000,000 |
Net periodic benefit cost (credit) |  |  |  |  | (29,000,000) | (84,000,000) | (80,000,000) |
Increase in fair value of plan assets |  |  |  | $ 146,000,000 |  |  |  |
Discount rate percentage |  |  |  | 4.10% |  |  |  |
Contributions to qualified defined benefit pension plans |  |  |  |  | 0 |  |  |
Dominion Energy Gas Holdings, LLC | Pension Benefits | Other operations and maintenance |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  | (8,000,000) | (35,000,000) | (35,000,000) |
Dominion Energy Gas Holdings, LLC | Pension Benefits | Net income from discontinued operations |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  | (14,000,000) | (21,000,000) | (20,000,000) |
Dominion Energy Gas Holdings, LLC | Other Postretirement Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  | 38,000,000 | (16,000,000) |  |
Expected return on pension and other postretirement plan assets |  |  |  |  | 16,000,000 | 28,000,000 | 24,000,000 |
Net periodic benefit cost (credit) |  |  |  |  | (11,000,000) | (14,000,000) | (9,000,000) |
Increase in fair value of plan assets |  |  |  | $ 29,000,000 |  |  |  |
Discount rate percentage |  |  |  | 4.05% |  |  |  |
Contributions to qualified defined benefit pension plans |  |  |  |  | 12,000,000 | 12,000,000 |  |
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | $ 74,000,000 |  |  |  |
Voluntary retirement program related charges net of tax |  |  |  | 58,000,000 |  |  |  |
Remeasurement resulted in increase in pension benefit obligation |  |  |  | 32,000,000 |  |  |  |
Increase in accumulated postretirement benefit obligation |  |  |  | 8,000,000 |  |  |  |
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program | Other operations and maintenance |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 39,000,000 |  |  |  |
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program | Other Taxes |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 2,000,000 |  |  |  |
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program | Other Income |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 1,000,000 |  |  |  |
Dominion Energy Gas Holdings, LLC | Voluntary Retirement Program | Net income loss from discontinued operations |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 32,000,000 |  |  |  |
Dominion Energy Gas Holdings, LLC | Pension Plans and Post Retirement Benefit Plan |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  |  |  | 167,000,000 | (129,000,000) |  |
Expected return on pension and other postretirement plan assets |  |  |  |  | 70,000,000 | 178,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Defined contribution plan, employer matching contributions |  |  |  |  | 20,000,000 | 20,000,000 | 19,000,000 |
Virginia Electric and Power Company | Other operations and maintenance | Dominion Energy Retiree Health And Welfare Plan [Member] | Multiemployer Plans, Postretirement Benefit |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  | (27,000,000) | (51,000,000) | (42,000,000) |
Virginia Electric and Power Company | Pension Benefits | Other operations and maintenance |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  | 152,000,000 | $ 126,000,000 | $ 110,000,000 |
Virginia Electric and Power Company | Other Postretirement Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Contribution to voluntary employees beneficiary association |  |  |  |  | $ 0 |  |  |
Virginia Electric and Power Company | Other Postretirement Benefits | Scenario, Forecast |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Contribution to voluntary employees beneficiary association | $ 0 |  |  |  |  |  |  |
Virginia Electric and Power Company | Voluntary Retirement Program |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 198,000,000 |  |  |  |
Voluntary retirement program related charges net of tax |  |  |  | 146,000,000 |  |  |  |
Virginia Electric and Power Company | Voluntary Retirement Program | Other operations and maintenance |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | 190,000,000 |  |  |  |
Virginia Electric and Power Company | Voluntary Retirement Program | Other Taxes |  |  |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary retirement program related charges |  |  |  | $ 8,000,000 |  |  |  |

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