Contribution To Voluntary Employees Beneficiary Association Trust

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- Definition

Defined benefit plan contributions by employer common shares.

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Defined benefit plan cost of providing special or contractual termination benefit recognized during period net of tax.

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- Definition

Pension or postretirement plan assets to be returned.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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- Definition

Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan.

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- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Amount of (increase) decrease to benefit obligation of defined benefit plan from remeasurement due to settlement. Excludes decrease to benefit obligation for settlement payment.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

Amount of cost of providing special or contractual termination benefits payable from defined benefit plan.

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

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- Definition

Amount of increase (decrease) in plan assets of defined benefit plan.

+ References

No definition available.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount of cost for defined contribution plan.

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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