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Sale of stock authorized amount.

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Share Based Compensation Arrangement By Share Based Payment Award Award Shares Issued Amount Maximum Percentage

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Amount of commitment made to pay deferred cash remuneration.

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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Amount of deferred tax liability attributable to taxable temporary differences from regulatory assets and liabilities.

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow resulting from the sale of an interest in a corporate unit during the period.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Number of new stock issued during the period.

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Number of share options (or share units) exercised during the current period.

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Equity (Narrative) (Detail) - USD ($) $ in Millions		1 Months Ended										3 Months Ended			12 Months Ended
Equity (Narrative) (Detail) - USD ($) $ in Millions	Jun. 14, 2019	Dec. 31, 2019	Oct. 31, 2019	Aug. 31, 2019	Jan. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Apr. 30, 2018	Feb. 28, 2018	Jan. 31, 2018	Jun. 30, 2017	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock				$ 1,400.0											$ 2,515.0	$ 2,461.0	$ 1,302.0
Issuance of common stock (in shares)				18,500,000											6,100,000
Fees and commissions paid	$ 28.0
Shares of common stock issued in acquisition, value					$ 1,600.0										$ 6,818.0
Number of shares received							27,000,000
Increase (decrease) Non-controlling interest							$ 375.0
Compensation cost related to stock-based compensation															46.0	48.0	45.0
Tax benefit from stock awards and stock options exercised															$ 11.0	12.0	16.0
Vesting period															3 years
Defined Benefit Pension plans															$ 499.0
Cash consideration from sale of noncontrolling interest		$ 2,100.0
SCANA
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued in acquisition					95,600,000										95,600,000
Shares of common stock issued in acquisition, value					$ 6,800.0										$ 6,800.0
Cash Based Performance Grant \| Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash-based performance grants maximum percentage															200.00%
February 2017 Cash Based Performance Grant [Member] \| Officer \| Two-year grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted amount of the grant		13.0										$ 13.0			$ 13.0
February 2017 Cash Based Performance Grant [Member] \| Officer \| Three-year grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted amount of the grant		13.0										13.0			13.0
Liability accrued for award		13.0										13.0			13.0
February 2018 Cash Based Performance Grant [Member] \| Officer \| Three-year grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted amount of the grant		15.0				$ 16.0						15.0		$ 16.0	15.0	16.0
Liability accrued for award		$ 8.0				$ 5.0						$ 8.0		5.0	$ 8.0	5.0
Cove Point
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership interest percentage of limited partner interests			25.00%			25.00%
Cash consideration from sale of noncontrolling interest			$ 2,100.0
Stock Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares were available for future grants		21,000,000										21,000,000			21,000,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested awards		$ 59.0										$ 59.0			$ 59.0
Fair value of restricted stock awards that vested															23.0	23.0	21.0
Dominion Midstream Partners, LP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued in acquisition					22,500,000
Converted right to receive shares					0.2492
Income taxes in equity primarily regulatory liabilities related to excess		$ 40.0										40.0			40.0
Dominion Energy Direct
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock															$ 309.0
Issuance of common stock (in shares)															4,000,000.0
Maximum \| Stock Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of stock based awards															8 years
Weighted Average \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected weighted-average period recognized for the unrecognized compensation cost															2 years 1 month 6 days
Goldman Sachs & Co. and Credit Suisse LLC.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock						$ 1.4
Issuance of common stock (in shares)						22,100,000
Number of shares for future agreement								20,000,000
Option exercised								2,100,000
Capital Unit, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock																	$ 1,000.0
Issuance of common stock (in shares)																	12,500,000
Various Programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock															$ 11,000.0	$ 2,500.0	$ 1.3
Issuance of common stock (in shares)															157,000,000	36,000,000	17,000,000
Shelf Registration for Sale of Common Stock through At-the-market Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock										$ 495.0		$ 639.0	$ 154.0	$ 197.0
Issuance of common stock (in shares)										6,600,000		7,800,000	2,100,000	2,700,000
Fees and commissions paid										$ 5.0		$ 6.0	$ 2.0	$ 2.0
Shelf Registration for Sale of Common Stock through At-the-market Program \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock authorized amount									$ 1,000.0		$ 500.0