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Equity (Narrative) (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
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 |  |  |  |  |  |

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