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Significant Financing Transactions (Narrative) (Detail) |  | 1 Months Ended | 3 Months Ended |  |  |
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Jun. 14, 2019 USD ($) $ / shares shares | Jun. 30, 2022 shares | Apr. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Jan. 31, 2019 USD ($) shares | Mar. 31, 2020 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) shares | Dec. 15, 2024 $ / shares | Feb. 29, 2020 USD ($) | Sep. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [1] |  |  |  | $ 6,000,000,000 |  |  |  | $ 6,000,000,000 |  |  |  |
Short-term debt |  |  |  |  | 2,190,000,000 | $ 911,000,000 | [2] |  | 2,190,000,000 |  |  |  |
Shares of common stock issued in acquisition, value |  |  |  |  |  |  |  |  |  | $ 6,818,000,000 |  |  |
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities |  |  |  |  |  |  |  |  |  | $ (40,000,000) |  |  |
Total Preferred Stock |  |  |  |  | $ 2,387,000,000 | $ 2,387,000,000 | [2] |  | $ 2,387,000,000 |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  |  |  |  |  | $ 1,020 |  |  |  |  |  |  |
Shelf Registration for Sale of Common Stock through At-the-market Program |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  | 0 |  |  |  |  |  |  |  |
Maximum | Shelf Registration for Sale of Common Stock through At-the-market Program |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Of Stock Authorized Amount |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued in acquisition | shares |  |  |  |  |  |  |  |  |  | 96,000,000 |  |  |
Shares of common stock issued in acquisition, value |  |  |  |  |  |  |  |  |  | $ 6,818,000,000 |  |  |
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities |  |  |  |  |  |  |  |  |  | $ 1,181,000,000 |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  | 1,000,000 | 3,000,000 |  |  |
2019 Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in undivided beneficial ownership |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Total Preferred Stock | [3] | $ 1,610,000,000 |  |  |  |  |  |  |  |  |  |  |
Dividend rate percentage |  | 1.75% |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  | 16,000,000 |  |  |  |  |  |  |  |  |  |  |
2019 Corporate Units | Scenario Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts | shares |  |  | 21,800,000 |  |  |  |  |  |  |  |  |  |
2019 Corporate Units | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to be paid under stock purchase contracts | $ / shares |  | $ 100 |  |  |  |  |  |  |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  |  |  |  |  |  |  | The notes would have otherwise matured in May 2021 and February 2022, respectively. |  |  |  |
Shares of common stock issued in acquisition | shares |  |  |  |  |  |  |  | 95,600,000 |  |  |  |  |
Shares of common stock issued in acquisition, value |  |  |  |  |  |  |  | $ 6,800,000,000 |  |  |  |  |
June 2006 Hybrids |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  |  |  |  |  |  |  |  | $ 111,000,000 |
September 2006 Hybrids |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  |  |  |  |  |  |  |  | $ 286,000,000 |
June 2006 and September 2006 Hybrids | Interest and Related Charges |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses related to early redemption of hybrids |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | 500,000,000 |  |  |  | 500,000,000 |  |  |  |
Short-term indebtedness outstanding |  |  |  |  |  |  |  |  | $ 2,200,000,000 |  |  |  |
Debt maturity month and year |  |  |  |  |  |  |  |  | 2021-03 |  |  |  |
Questar Gas |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 250,000,000 |  |  |  | $ 250,000,000 |  |  |  |
GESC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |
Debt maturity month and year |  |  |  |  |  |  |  |  | 2021-03 |  |  |  |
Dominion Energy Midstream Partners, LP |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued in acquisition | shares |  |  |  |  |  |  |  | 22,500,000 |  |  |  |  |
Shares of common stock issued in acquisition, value |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  |  |  | 2.993% |  |  |  |  |  |  |
Dominion Energy | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized | shares |  |  |  |  |  | 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% |  |  |  |  |  |  |
Dividend stock |  |  |  |  |  |  |  |  | $ 9,000,000 |  |  |  |
Dividends Payable, Amount Per Share | $ / shares |  |  |  |  | $ 11.625 |  |  |  | $ 11.625 |  |  |  |
Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | SBL Holdco |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 30,000,000 |  |  |  | $ 30,000,000 |  |  |  |
Automatic renewal period |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Short-term debt |  |  |  |  | 0 |  |  |  | $ 0 |  |  |  |
Credit Facilities, Maturing in May 2018 with 1 year Automatic Renewals through 2024 | Dominion Solar Projects III, Inc |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | 25,000,000 |  |  |  | $ 25,000,000 |  |  |  |
Automatic renewal period |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Short-term debt |  |  |  |  | 0 |  |  |  | $ 0 |  |  |  |
Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  | $ 500,000,000 |  |  |  | 500,000,000 |  |  |  |
Debt Instrument, Term |  |  |  |  | 364 days |  |  |  |  |  |  |  |
Term Loan Credit Agreement | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  | $ 625,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 364 days |  |  |  |  |  |  |  |  |
Floating rate senior notes | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  | $ 66,000,000 |  |  |  | $ 66,000,000 |  |  |  |
Debt Instrument, Maturity Date, Description |  |  |  |  |  |  |  |  | The notes would have otherwise matured in June 2034. |  |  |  |
Floating rate senior notes | Interest and Related Charges | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses related to early redemption of hybrids |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  |  |
4.75% Medium Term Notes | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  | $ 183,000,000 |  |  |  | $ 183,000,000 |  |  |  |
Interest Rate |  |  |  |  | 4.75% |  |  |  | 4.75% |  |  |  |
4.125% Medium Term Notes | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  | $ 155,000,000 |  |  |  | $ 155,000,000 |  |  |  |
Interest Rate |  |  |  |  | 4.125% |  |  |  | 4.125% |  |  |  |
4.75% and 4.125% Medium Term Notes | Interest and Related Charges | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses related to early redemption of hybrids |  |  |  |  |  |  |  |  | $ 14,000,000 |  |  |  |
Senior Notes Due in 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.30% |  |  |  | 3.30% |  |  |  |
Total Long-term Debt |  |  |  |  | $ 400,000,000 |  |  |  | $ 400,000,000 |  |  |  |
Debt maturity year |  |  |  |  | 2025 |  |  |  |  |  |  |  |
Senior Notes Due in 2025 | Subsequent Event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 3.375% |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  | 2030 |  |  |  |  |  |  |  |  |
Senior Notes Due in 2027 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.60% |  |  |  | 3.60% |  |  |  |
Total Long-term Debt |  |  |  |  | $ 350,000,000 |  |  |  | $ 350,000,000 |  |  |  |
Debt maturity year |  |  |  |  | 2027 |  |  |  |  |  |  |  |
Senior Notes Due in 2030 | PSNC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.05% |  |  |  | 4.05% |  |  |  |
Total Long-term Debt |  |  |  |  | $ 200,000,000 |  |  |  | $ 200,000,000 |  |  |  |
Debt maturity year |  |  |  |  | 2030 |  |  |  |  |  |  |  |
2.579% Junior Subordinated Notes | Subsequent Event | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity month and year |  |  |  | 2020-07 |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 2.579% |  |  |  |  |  |  |  |  |
Debt instrument repurchased and canceled amount |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 2,000,000,000.0 |  |  |  | 2,000,000,000.0 |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | 21,000,000 |  |  |  | $ 21,000,000 |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000,000
Line of credit facility, termination date |  |  |  |  |  |  |  |  | Jun. 30, 2020 |  |  |  |
364-day Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | 900,000,000 |  |  |  | $ 900,000,000 |  |  |  |
Credit facility, outstanding amount |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  |  |
Debt Instrument, Term |  |  |  |  | 364 days |  |  |  |  |  |  |  |
364-day Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowings |  |  |  | $ 225,000,000 |  |  |  |  |  |  |  |  |
[1] | This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Dominion Energy recorded dividends of $7 million ($4.375 per share) for the three months ended March 31, 2020.

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