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Long-Term Debt (Total Long Term Debt) (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Apr. 30, 2020 | Feb. 29, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  |  | $ 2,879 | $ 9,116 | $ 5,682 |
Total principal | [1] |  |  |  | $ 35,496 | 31,557 |  |
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. |  |  |
June2006 Hybrids |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  | $ 111 |  |  |  |
September 2006 hybrids |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  | $ 286 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 13 |  |
Term loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Estimated mandatory prepayments due within one year |  |  |  |  | $ 22 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of Debt |  |  |  |  | 427 | 591 | $ 964 |
Total principal |  |  |  |  | 13,314 | 12,414 |  |
2.45% to 8.875%, due 2022 to 2050 | Virginia Electric and Power Company | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total principal |  |  |  |  | $ 12,689 | 11,789 |  |
2.45% to 8.875%, due 2022 to 2050 | Minimum | Virginia Electric and Power Company | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.45% |  |  |
2.45% to 8.875%, due 2022 to 2050 | Maximum | Virginia Electric and Power Company | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 8.875% |  |  |
0.45% to 1.90%, due 2032 to 2041 | Virginia Electric and Power Company | Tax-Exempt Financings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total principal | [2] |  |  |  | $ 625 | 625 |  |
0.45% to 1.90%, due 2032 to 2041 | Minimum | Virginia Electric and Power Company | Tax-Exempt Financings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 0.45% |  |  |
0.45% to 1.90%, due 2032 to 2041 | Maximum | Virginia Electric and Power Company | Tax-Exempt Financings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.90% |  |  |
2.0% to 7.0%, due 2021 to 2049 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total principal | [3] |  |  |  | $ 9,938 | 7,688 |  |
2.0% to 7.0%, due 2021 to 2049 | Minimum | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.00% |  |  |
2.0% to 7.0%, due 2021 to 2049 | Maximum | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 7.00% |  |  |
2.579% to 4.104%, due 2019 to 2024 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  | 2.579% |  |  |  |  |
Repayment of Debt |  |  | $ 7 |  |  |  |  |
Pre-payment of Debt |  | $ 993 |  |  |  |  |  |
2.579% to 4.104%, due 2019 to 2024 [Member] | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total principal | [4] |  |  |  | $ 1,950 | 2,950 |  |
2.579% to 4.104%, due 2019 to 2024 [Member] | Minimum | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.579% |  |  |
2.579% to 4.104%, due 2019 to 2024 [Member] | Maximum | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.104% |  |  |
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 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total principal |  |  |  |  | $ 1,485 | 1,485 |  |
5.25% and 5.75%, due 2054 and 2076 | Minimum | Enhanced Junior Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 5.25% |  |  |
5.25% and 5.75%, due 2054 and 2076 | Maximum | Enhanced Junior Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 5.75% |  |  |
2.98% to 7.20%, due 2024 to 2051 | Minimum | Questar Gas Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.98% |  |  |
2.98% to 7.20%, due 2024 to 2051 | Maximum | Questar Gas Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 7.20% |  |  |
1.30% to 3.00%, due 2025 to 2050 | Minimum | East Ohio |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.30% |  |  |
1.30% to 3.00%, due 2025 to 2050 | Maximum | East Ohio |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.00% |  |  |
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% |  |  |
4.05% to 7.45%, due 2020 to 2047 | Minimum | PSNC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.05% |  |  |
4.05% to 7.45%, due 2020 to 2047 | Maximum | PSNC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 7.45% |  |  |
First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 | Minimum | DESC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.22% |  |  |
First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 | Maximum | DESC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.625% |  |  |
3.625% and 4.00%, due 2028 and 2033 | Tax-Exempt Financings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total principal | [5] |  |  |  | $ 54 | 54 |  |
3.625% and 4.00%, due 2028 and 2033 | Minimum | Tax-Exempt Financings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.625% |  |  |
3.625% and 4.00%, due 2028 and 2033 | Maximum | Tax-Exempt Financings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.00% |  |  |
4.82%, due 2042 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.82% |  |  |
Total principal | [6] |  |  |  | $ 331 | 345 |  |
Tax-Exempt Financing, 1.7% due 2033 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.70% |  |  |
Tax-Exempt Financing, 1.7% due 2033 | Tax-Exempt Financings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total principal |  |  |  |  | $ 27 | $ 27 |  |
Four Point Seven Five Percent Medium Term Notes | DS C A N A |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 4.75% |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 183 |  |  |  |
Four Point One Two Five Percent Medium Term Notes | DS C A N A |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 4.125% |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 155 |  |  |  |
Floating rate senior notes | DS C A N A |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 66
Debt instrument, maturity date, description |  |  |  |  | The notes would have otherwise matured in June 2034 |  |  |
Industrial Revenue Bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total principal |  |  |  |  | $ 68 |  |  |
[1] | Excludes amounts classified as held for sale. See Note 3.
[2] | These financings relate to certain pollution control equipment at Virginia Power’s generating facilities.
[3] | Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.
[4] | In April 2020, Dominion Energy purchased and canceled $7 million of its 2.579% junior subordinated notes that mature in July 2020. In June 2020, Dominion Energy prepaid the remaining balance of $993 million.
[5] | Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2021.
[6] | 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.

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