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Long-Term Debt (Total Long Term Debt) (Parenthetical) (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 01, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Sep. 30, 2019 | May 31, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  |  |  |  |  | $ 9,116 |  | $ 5,682 | $ 1,572 |
Total principal |  |  |  |  |  |  |  | 37,118 |  | 35,070 |  |
Term loans |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated mandatory prepayments due within one year |  |  |  |  |  |  |  | 20 |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  |  |  |  |  | 3,750 |  | 255 |  |
Total principal |  |  |  |  |  |  |  | 5,561 |  | 7,890 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  |  |  |  |  | 591 |  | 964 | $ 681 |
Total principal |  |  |  |  |  |  |  | $ 12,414 |  | 11,754 |  |
SCANA [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of medium term notes |  |  |  |  |  | $ 300 |  |  |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of first mortgage bonds |  |  |  |  |  |  | $ 1,800 |  |  |  |  |
September 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  |  |  |  |  |  |  |  | $ 286
September 2006 hybrids | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Debt |  | $ 286 |  |  |  |  |  |  |  |  |  |
June 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | 13
Debt, amount redeemed |  |  |  |  |  |  |  |  |  |  |  | $ 111
June 2006 hybrids | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Debt |  | $ 111 |  |  |  |  |  |  |  |  |  |
8.4% due 2031 | Unsecured junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 8.40% |  |  |  |
Total principal |  |  |  |  |  |  |  | $ 10 |  | 10 |  |
5.25% and 5.75%, due 2054 and 2076 | Enhanced Junior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  | $ 1,485 |  | 1,485 |  |
5.25% and 5.75%, due 2054 and 2076 | Enhanced Junior Subordinated Notes [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 5.25% |  |  |  |
5.25% and 5.75%, due 2054 and 2076 | Enhanced Junior Subordinated Notes [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 5.75% |  |  |  |
2.0%, due 2021 and 2024 | Remarketable subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 2.00% |  |  |  |
Total principal |  |  |  |  |  |  |  |  |  | 1,400 |  |
4.82%, due 2042 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 4.82% |  |  |  |
Total principal |  |  |  |  |  |  |  | $ 345 | [1] | 362 |  |
2.98% to 7.20%, due 2024 to 2051 | Questar Gas | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 2.98% |  |  |  |
2.98% to 7.20%, due 2024 to 2051 | Questar Gas | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 7.20% |  |  |  |
Unsecured senior notes, 3.53% to 4.875%, due 2028 to 2041 | Dominion Energy Questar Pipeline LLC | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 3.53% |  |  |  |
Unsecured senior notes, 3.53% to 4.875%, due 2028 to 2041 | Dominion Energy Questar Pipeline LLC | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 4.875% |  |  |  |
Unsecured Senior Notes 1.6% to 7.0%, due 2019 to 2049 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total principal | [2] |  |  |  |  |  |  | $ 7,688 |  | 7,488 |  |
Unsecured Senior Notes 1.6% to 7.0%, due 2019 to 2049 | Senior Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 1.60% |  |  |  |
Unsecured Senior Notes 1.6% to 7.0%, due 2019 to 2049 | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 7.00% |  |  |  |
PSNC, Senior Debentures and Notes, 4.13% to 7.45%, due 2020 to 2047 | PSNC [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 4.13% |  |  |  |
PSNC, Senior Debentures and Notes, 4.13% to 7.45%, due 2020 to 2047 | PSNC [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 7.45% |  |  |  |
First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 | DESC | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 3.22% |  |  |  |
First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 | DESC | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 6.625% |  |  |  |
3.625% and 4.00%, due 2028 and 2033 | Tax Exempt Financing |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total principal | [3] |  |  |  |  |  |  | $ 54 |  |  |  |
3.625% and 4.00%, due 2028 and 2033 | Tax Exempt Financing | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 3.625% |  |  |  |
3.625% and 4.00%, due 2028 and 2033 | Tax Exempt Financing | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 4.00% |  |  |  |
Tax-Exempt Financing, 1.7% due 2033 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 1.70% |  |  |  |
Tax-Exempt Financing, 1.7% due 2033 | Tax Exempt Financing |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  | $ 27 |  | 27 |  |
1.80% to 5.0%, due 2023 to 2041 | Virginia Electric and Power Company | Tax Exempt Financing |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total principal | [4],[5] |  |  |  |  |  |  | $ 625 |  | 664 |  |
1.80% to 5.0%, due 2023 to 2041 | Virginia Electric and Power Company | Tax Exempt Financing | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 1.80% |  |  |  |
1.80% to 5.0%, due 2023 to 2041 | Virginia Electric and Power Company | Tax Exempt Financing | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 5.00% |  |  |  |
2.75% to 8.875%, due 2019 to 2049 | Virginia Electric and Power Company | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  | $ 11,789 |  | $ 11,090 |  |
2.75% to 8.875%, due 2019 to 2049 | Virginia Electric and Power Company | Senior Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 2.75% |  |  |  |
2.75% to 8.875%, due 2019 to 2049 | Virginia Electric and Power Company | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 8.875% |  |  |  |
2.5% to 4.8%, due 2019 to 2049 | Dominion Energy Gas Holdings, LLC | Senior Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 2.50% |  |  |  |
2.5% to 4.8%, due 2019 to 2049 | Dominion Energy Gas Holdings, LLC | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 4.80% |  |  |  |
2.579% to 4.104%, due 2019 to 2024 | Unsecured junior subordinated notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 2.579% |  |  |  |
2.579% to 4.104%, due 2019 to 2024 | Unsecured junior subordinated notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 4.104% |  |  |  |
4.125% to 6.25%, due 2020 to 2022 | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 4.125% |  |  |  |
4.125% to 6.25%, due 2020 to 2022 | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 6.25% |  |  |  |
Senior notes due in two zero two four | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 5.49% |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 33 |  |  |  |  |
Industrial Revenue Bonds |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  | $ 68 |  |  |  |
Term Loan Due 2021 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  |  | $ 3,000 |  |  |  |  |  |  |
Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 5.00% |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  |  | $ 40 |  |  |  |  |  |
Scenario, Forecast | September 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  | $ 286 |  |  |  |  |  |  |  |
Scenario, Forecast | June 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  | $ 111 |  |  |  |  |  |  |  |
Scenario, Forecast | DS C A N A |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  |  | The notes would have otherwise matured in May 2021 and February 2022, respectively. |  |  |  |  |  |  |  |
Scenario, Forecast | DS C A N A | Floating rate senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 66 |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | The notes would have otherwise matured in June 2034 |  |  |  |  |  |  |  |  |
Scenario, Forecast | DS C A N A | Four Point Seven Five Percent Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 4.75% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 183 |  |  |  |  |  |  |  |
Scenario, Forecast | DS C A N A | Four Point One Two Five Percent Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 4.125% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 155 |  |  |  |  |  |  |  |
[1] | Represents debt associated with Eagle Solar, SBL Holdco and Dominion Solar Projects III, Inc. The debt is nonrecourse to Dominion Energy and is secured by Eagle Solar’s, SBL Holdco’s and Dominion Solar Projects III, Inc’s interest in certain solar facilities.
[2] | Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.
[3] | Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2020.
[4] | In May 2019, Virginia Power redeemed its $40 million 5.0% Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 at the principal outstanding plus accrued interest.
[5] | These financings relate to certain pollution control equipment at Virginia Power’s generating facilities.

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