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Preferred Stock (Narrative) (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2022 | May 31, 2022 | Dec. 31, 2021 | Sep. 30, 2020 | Dec. 31, 2019 | Aug. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Apr. 15, 2027 | Dec. 15, 2024 | Sep. 30, 2022 | Aug. 31, 2021 | Jun. 30, 2019 | Jun. 14, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |
Total Preferred Stock |  |  | $ 1,783,000,000 |  |  |  | $ 1,783,000,000 | $ 1,783,000,000 |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |
Debt repurchased value |  |  |  |  |  | $ 154,000,000 | 263,000,000 |  |  |  |  |  | $ 39,000,000 |  |
Dividend stock |  |  |  |  |  |  | $ 93,000,000 | $ 68,000,000 | $ 65,000,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  |  |  | 0 | 0 | 38,900,000 |  |  |  |  |  |
2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount corporate units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000,000
Percentage of interest in undivided beneficial ownership |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
2019 Series A Corporate Units | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to be paid under stock purchase contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassifications of permanent to mezzanine equity |  |  |  |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |
Conversion of stock, description |  |  |  |  |  |  | Series A Preferred Stock be settled, at Dominion Energy’s election, either entirely in cash or in cash up to the first $1,000 per share and in shares of Dominion Energy common stock, cash or any combination thereof for any amounts in excess of $1,000 per share |  |  |  |  |  |  |  |
Debt repurchased value |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000,000 |  |  |
Series A Preferred Stock | 2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate percentage |  | 1.75% |  |  |  | 1.75% |  |  |  |  |  |  |  |  |
Preferred stock dividend rate increase percentage | 6.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  | $ 1,020 |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  | $ 1,020 |  |  |  |  | $ 1,020 |  |  |  |  |  |  |
Series C Preferred Stock | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 3,400,000 |  |  |  | 1,800,000 | 3,400,000 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 3,400,000 |  |  |  | 1,800,000 | 3,400,000 |  |  |  |  |  |  |
Dominion Energy | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 1,600,000 |  |  |  |  | 1,600,000 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 1,600,000 |  |  |  |  | 1,600,000 |  |  |  |  |  |  |
Dominion Energy | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 800,000 |  | 800,000 |  | 800,000 | 800,000 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 800,000 |  |  |  | 800,000 | 800,000 |  |  |  |  |  |  |
Total Preferred Stock |  |  |  |  | $ 791,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of costs |  |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation value |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  |  | 4.65% |  | 2.993% |  |  |  |  |  |  |  |
Dividend stock |  |  |  |  |  |  | $ 37,000,000 | $ 37,000,000 | $ 37,000,000 |  |  |  |  |  |
Dividends per share |  |  |  |  |  |  | $ 46.50 | $ 46.50 | $ 46.50 |  |  |  |  |  |
Dominion Energy | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 1,000,000.0 |  |  |  | 1,000,000.0 | 1,000,000.0 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 1,000,000.0 |  |  |  | 1,000,000.0 | 1,000,000.0 |  |  |  |  |  |  |
Issuance of costs |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation value |  |  | $ 1,000 |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Dividend rate percentage |  |  | 4.35% |  |  |  | 3.195% |  |  |  |  |  |  |  |
Dividend stock |  |  |  |  |  |  | $ 44,000,000 | $ 3,000,000 |  |  |  |  |  |  |
Dividends per share |  |  |  |  |  |  | $ 43.50 | $ 2.6583 |  |  |  |  |  |  |
Preferred stock shares issued to public |  |  | 750,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock value issued to public |  |  | $ 742,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares to qualified benefit pension plan |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Pension plans |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Held By SCANA |  |  | 1,000 |  |  |  | 1,000 | 1,000 |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized |  |  | 10,000,000 |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |
Liquidation preference |  |  | $ 100 |  |  |  | $ 100 | $ 100 |  |  |  |  |  |  |

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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