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Equity (Narrative) (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2022 USD ($) shares | Jun. 30, 2022 USD ($) shares | May 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) | Nov. 30, 2021 $ / shares shares | Aug. 31, 2021 USD ($) shares | Jul. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Nov. 30, 2020 USD ($) shares | Sep. 30, 2020 USD ($) Agreement shares | Aug. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) shares | Dec. 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Jul. 31, 2020 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,866,000,000 | $ 192,000,000 | $ 159,000,000 |
Issuance of common stock value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,969,000,000 | 1,332,000,000 | 481,000,000 |
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 |
Compensation cost related to stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 | 42,000,000 | $ 64,000,000 |
Tax benefit from stock awards and stock options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 | 9,000,000 | 16,000,000 |
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% |  |  |
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 |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |
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 | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |
February 2021 Cash Based Performance Grant | Officer | Grant Date Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |
Liability accrued for award | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |
February 2022 Cash Based Performance Grant | Officer | Grant Date Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant | 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,000,000 |  |  |
Liability accrued for award | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |
Stock Based Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares were available for future grants | shares | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to nonvested awards | $ 58,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 58,000,000 |  |  |
Fair value of restricted stock awards that vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,000,000 | $ 37,000,000 | $ 35,000,000 |
Cove Point | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Reversal of noncontrolling interest held by noncontrolling owners |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |
Cove Point | BHE | GT&S Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
S B L Holdco L L C | Nonregulated Solar Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold |  |  |  | 67.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Four Brothers And Three Cedars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  | 400,000 | 900,000 |  |  | 600,000 | 1,400,000 |  |  | 4,100,000 |  |  |  |  | 25,000,000 | 4,000,000 | 7,000,000 |
Issuance of common stock value |  | $ 30,000,000 | $ 72,000,000 |  |  | $ 45,000,000 | $ 104,000,000 |  |  |  |  |  |  |  | $ 1,969,000,000 | $ 340,000,000 | $ 481,000,000 |
Stock repurchased, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 38,900,000 |
Stock repurchased, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,080,000,000 |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  | $ 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 |  |  |  |
2019 Series A Corporate Units | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  | 19,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Direct |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 179,000,000 | $ 192,000,000 | $ 159,000,000 |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 | 2,600,000 | 2,100,000 |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000.0 | $ 340,000,000 | $ 481,000,000 |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 | 4,000,000 | 7,000,000 |
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 (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
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 |  |  |  |  |  |  |
Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock | $ 78,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward sale agreements, number of shares of common stock to be settled | shares |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Initial forward price of share | $ / shares |  |  |  |  | $ 74.66 |  |  |  |  |  |  |  |  |  |  |  |  |

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