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Long-Term Debt (Total Long Term Debt) (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [1],[2],[3] | 1.65% |  |  |
Total principal |  | $ 37,118 |  | $ 35,070 |
Securities due within one year | [4],[5],[6],[7] | (3,133) |  | (3,624) |
Unamortized discount and debt issuance costs |  | (270) |  | (248) |
Total long term debt |  | 33,824 |  | 31,144 |
Fair value hedge valuation |  | 4 |  | (20) | [8]
Credit facility borrowings | [9] |  |  | (73) |
Dominion Energy, Inc. total long-term debt |  | 33,824 |  | 31,144 |
Finance Lease, Liability |  | $ 134 |  | 39 |
4.82%, due 2042 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[10] | 4.82% |  |  |
Total principal |  | $ 345 | [10] | 362 |
Term loans, variable rates, due 2023 and 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[10] | 4.24% |  |  |
Total principal |  | $ 527 | [10] | 582 |
Long term debt due within one year |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[4],[5],[7],[11] | 3.41% |  |  |
Senior Notes | Variable rates, due 2019 and 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 2.31% |  |  |
Total principal |  | $ 300 |  | 800 |
Senior Notes | 1.6% to 7.0%, due 2019 to 2049 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[12] | 4.15% |  |  |
Total principal | [12] | $ 7,688 |  | 7,488 |
Tax Exempt Financing | 3.625% and 4.00%, due 2028 and 2033 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [2],[3] | 3.90% |  |  |
Total principal | [2] | $ 54 |  |  |
Tax Exempt Financing | Variable Rate Due 2038 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [2],[3] | 1.65% |  |  |
Total principal | [2] | $ 35 |  |  |
Tax Exempt Financing | Other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [2] | 3.69% |  |  |
Total principal | [2] | $ 1 |  |  |
Tax Exempt Financing | Tax-Exempt Financing, 1.7% due 2033 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 1.70% |  |  |
Total principal |  | $ 27 |  | 27 |
Tax Exempt Financing | GENCO variable rate due 2038 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total principal | [1],[2] | $ 33 |  |  |
Unsecured junior subordinated notes | 8.4% due 2031 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 8.40% |  |  |
Total principal |  | $ 10 |  | 10 |
Unsecured junior subordinated notes | 2.579% to 4.104%, due 2019 to 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 3.01% |  |  |
Total principal |  | $ 2,950 |  | 2,100 |
Enhanced Junior Subordinated Notes | Variable rates, due 2066 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[4] | 4.41% |  |  |
Total principal | [4] | $ 397 |  | 422 |
Enhanced Junior Subordinated Notes | 5.25% and 5.75%, due 2054 and 2076 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 5.48% |  |  |
Total principal |  | $ 1,485 |  | 1,485 |
Remarketable subordinated notes | 2.0%, due 2021 and 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total principal |  |  |  | 1,400 |
Questar Gas | 2.98% to 7.20%, due 2024 to 2051 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 4.25% |  |  |
Total principal |  | $ 750 |  | 750 |
SCANA | Unsecured Senior Notes, variable rate, due 2034 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[11] | 2.61% |  |  |
Total principal | [6] | $ 66 |  |  |
SCANA | 4.125% to 6.25%, due 2020 to 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[5],[13] | 5.06% |  |  |
Total principal | [5],[13] | $ 508 |  |  |
PSNC | 4.13% to 7.45%, due 2020 to 2047 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 5.05% |  |  |
Total principal |  | $ 700 |  |  |
DESC | First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[14] | 5.42% |  |  |
Total principal | [14] | $ 3,267 |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total principal |  | 5,561 |  | 7,890 |
Securities due within one year |  | (699) |  | (748) |
Unamortized discount and debt issuance costs |  | (41) |  | (47) |
Total long term debt |  | 4,826 |  | 7,022 |
Credit facility borrowings | [9] |  |  | (73) |
Dominion Energy, Inc. total long-term debt |  | 4,826 |  | 7,022 |
Finance Lease, Liability |  | $ 6 |  |  |
Dominion Energy Gas Holdings, LLC | Long term debt due within one year |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 2.80% |  |  |
Dominion Energy Gas Holdings, LLC | Senior Notes | Unsecured senior notes Variable rate, due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 2.49% |  |  |
Total principal |  | $ 500 |  | 500 |
Dominion Energy Gas Holdings, LLC | Senior Notes | 2.5% to 3.55%, due 2019 to 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[15] | 3.44% |  |  |
Total principal |  | $ 4,631 |  | 3,587 |
Dominion Energy Gas Holdings, LLC | Senior Notes | Cove Point, term loan, due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total principal | [16] |  |  | 3,000 |
Dominion Energy Gas Holdings, LLC | Dominion Energy Midstream | Revolving credit agreement variable rates due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total principal | [9] |  |  | 73 |
Dominion Energy Gas Holdings, LLC | Dominion Energy Midstream | Unsecured senior notes, 3.53% to 4.875%, due 2028 to 2041 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 4.23% |  |  |
Total principal |  | $ 430 |  | 430 |
Dominion Energy Gas Holdings, LLC | Dominion Energy Midstream | Term loan, variable rate, due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total principal |  |  |  | 300 |
Virginia Electric and Power Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total principal |  | 12,414 |  | 11,754 |
Securities due within one year |  | (1) |  | (350) |
Unamortized discount and debt issuance costs |  | (88) |  | (83) |
Total long term debt |  | 12,341 |  | 11,321 |
Dominion Energy, Inc. total long-term debt |  | 12,341 |  | 11,321 |
Finance Lease, Liability |  | $ 19 |  |  |
Virginia Electric and Power Company | Long term debt due within one year |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 4.29% |  |  |
Virginia Electric and Power Company | Senior Notes | 2.75% to 8.875%, due 2019 to 2049 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) |  | 4.27% |  |  |
Total principal |  | $ 11,789 |  | 11,090 |
Virginia Electric and Power Company | Tax Exempt Financing | 1.80% to 5.0%, due 2023 to 2041 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
2019 Weighted- average Coupon (percentage) | [3],[17],[18] | 2.02% |  |  |
Total principal | [17],[18] | $ 625 |  | $ 664 |
[1] | In May 2019, GENCO redeemed its 5.49% senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest. In June 2019, the first mortgage lien on an electric generating facility that previously secured these notes was released.
[2] | Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2020.
[3] | Represents weighted-average coupon rates for debt outstanding as of December 31, 2019.
[4] | In February 2020, Dominion Energy purchased and cancelled the remaining $111 million and $286 million of its June 2006 hybrids and September 2006 hybrids, respectively, both of which would have otherwise matured in 2066. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[5] | In February 2020, SCANA provided notice to redeem the remaining principal outstanding of $183 million of its 4.75% medium-term notes and $155 million of its 4.125% medium-term notes plus accrued interest and make-whole premiums in March 2020. The notes would have otherwise matured in May 2021 and February 2022, respectively. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[6] | In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[7] | Includes $20 million of estimated mandatory prepayments due within one year based on estimated cash flows in excess of debt service at SBL Holdco and Dominion Solar Projects III, Inc.
[8] | Represents the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt.
[9] | In February 2019, Dominion Energy Midstream repaid its $300 million variable rate term loan due in December 2019 and terminated the credit facility due in March 2021 subsequent to repaying the $73 million outstanding balance. As such, credit facility borrowings are presented within current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets at December 31, 2018.
[10] | 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.
[11] | In January 2020, SCANA provided notice to redeem its floating rate senior notes at the remaining principal outstanding of $66 million plus accrued interest in March 2020. The notes would have otherwise matured in June 2034. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019. As such, this borrowing are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[12] | Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.
[13] | In March 2019, SCANA purchased certain of its medium term notes having an aggregate purchase price of $300 million pursuant to tender offer that expired in the first quarter of 2019.
[14] | In February, March and September 2019, DESC purchased certain of its first mortgage bonds having an aggregate purchase price of $1.8 billion pursuant to tender offers. The February and March tender offers expired in the first quarter of 2019 and the September tender offer expired in the third quarter of 2019.
[15] | Amount includes foreign currency remeasurement adjustments.
[16] | In September 2019, Cove Point repaid its $3.0 billion term loan due in 2021.
[17] | 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.
[18] | These financings relate to certain pollution control equipment at Virginia Power’s generating facilities.

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