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Equity (Narrative) (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2020 USD ($) shares | Nov. 30, 2020 USD ($) shares | Sep. 30, 2020 USD ($) agreement shares | Aug. 31, 2020 USD ($) shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Oct. 31, 2019 | Aug. 31, 2019 USD ($) shares | Jan. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Jun. 30, 2018 USD ($) shares | Apr. 30, 2018 shares | Jan. 31, 2018 USD ($) shares | Dec. 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Mar. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Jul. 31, 2020 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |  |  | $ 159,000,000 | $ 2,515,000,000 | $ 2,461,000,000 |
Issuance of common stock (in shares) | shares |  |  | 4,100,000 |  |  |  |  | 18,500,000 |  |  |  |  |  |  |  |  |  |  |  | 6,100,000 |  |
Acquisition of SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,818,000,000 |  |
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (40,000,000) |  |
Defined Benefit Pension plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 499,000,000 |  |
Fees and commissions paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,000,000 |  |
Stock repurchased, shares | shares |  |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, value |  |  | $ 323,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,080,000,000 |  |  |
Number of prepaid accelerated share repurchase agreements | agreement |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, payments | $ 400,000,000 |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 1,500,000,000 |  |  |  | $ 400,000,000 |  |  |
Accelerated share repurchase, cash paid for number of shares exchange | shares | 5,000,000.0 |  | 17,200,000 |  |  |  |  |  |  |  |  |  |  | 5,000,000.0 | 17,200,000 |  |  |  | 5,000,000.0 |  |  |
Decrease in common stock | $ 400,000,000 | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock worth based on closing Price | $ 400,000,000 |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 1,500,000,000 |  |  |  | $ 400,000,000 |  |  |
Accelerated share repurchase, additional shares delivered under terms of the agreement | shares | 300,000 | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  | 300,000 |  |  |
Number of shares received | shares |  |  |  |  |  |  |  |  |  |  | 27,000,000 |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) Non-controlling interest |  |  |  |  |  |  |  |  |  |  | $ 375,000,000 |  |  |  |  |  |  |  |  |  |  |
Compensation cost related to stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,000,000 | 46,000,000 | 48,000,000 |
Tax benefit from stock awards and stock options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,000,000 | 11,000,000 | 12,000,000 |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Cash Based Performance Grant | Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash-based performance grants minimum percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |
Cash-based performance grants maximum percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |
February2018 Cash Based Performance Grant | Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  | $ 15,000,000 |  |  |
February2019 Cash Based Performance Grant | Officer | Grant Date Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  | 15,000,000 |  |  |
Liability accrued for award | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  | 14,000,000 |  |  |
February 2020 Cash Based Performance Grant | Officer | Grant Date Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |  |  | 16,000,000 |  |  |
Liability accrued for award | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  | $ 8,000,000 |  |  |
Stock Based Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares were available for future grants | shares | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  | 20,000,000 |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to nonvested awards | $ 61,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 61,000,000 |  |  |  |  | $ 61,000,000 |  |  |
Fair value of restricted stock awards that vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000 | $ 23,000,000 | $ 23,000,000 |
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 |  |  |  |  |  | $ 2,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cove Point | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of noncontrolling interest held by noncontrolling owners |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 | 39,000,000 | 36,000,000 |
Acquisition of SCANA (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,000,000 |  |
Acquisition of SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,818,000,000 |  |
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,181,000,000 |  |
Defined Benefit Pension plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 499,000,000 |  |
Fees and commissions paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000 |  |
Stock repurchased, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,900,000 | 0 | 0 |
Stock repurchased, value |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,080,000,000 |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000.0
Common Stock | Open Market Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 | 7,200,000 |  |  |  |  |  |  |
Stock repurchased, value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 295,000,000 | $ 562,000,000 |  |  |  |  |  |  |
Goldman Sachs & Co. and Credit Suisse LLC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  | 22,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares for future agreement | shares |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |
Option exercised | shares |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |
Dominion Energy Midstream Partners, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of SCANA (in shares) | shares |  |  |  |  |  |  |  |  | 22,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of SCANA |  |  |  |  |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common units conversion ratio |  |  |  |  |  |  |  |  | 0.2492 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain or loss recognized in equity transaction |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Direct |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 159,000,000 |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of SCANA (in shares) | shares |  |  |  |  |  |  |  |  | 95,600,000 |  |  |  |  |  |  |  |  |  |  | 95,600,000 |  |
Acquisition of SCANA |  |  |  |  |  |  |  |  | $ 6,800,000,000 |  |  |  |  |  |  |  |  |  |  | $ 6,800,000,000 |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 481,000,000,000 | $ 11,000,000,000.0 | $ 2,500,000,000 |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 | 157,000,000 | 36,000,000 |
Sales Agency Agreements to Effect Sales Under At-the-market Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 495,000,000 |  |  | $ 639,000,000 | $ 154,000,000 | $ 197,000,000 |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  | 0 | 0 |  |  |  |  |  |  |  | 6,600,000 |  |  | 7,800,000 | 2,100,000 | 2,700,000 |  |  |  |
Fees and commissions paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  | $ 6,000,000 | $ 2,000,000 | $ 2,000,000 |  |  |  |
Sale of stock authorized amount |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Agency Agreements to Effect Sales Under At-the-market Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock authorized amount |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting Agreement | Goldman Sachs & Co. and Credit Suisse LLC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares for future agreement | shares |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |

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