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Long-Term Debt (Total Long Term Debt) (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates |  | 0.29% | 2.10%
Total principal | [1] | $ 35,496 | $ 31,557
Securities due within one year | [2] | (1,905) | (2,435)
Unamortized discount, premium and debt issuances costs, net |  | (293) | (228)
Derivative restructuring |  | 773 |
Finance leases | [3] | 108 | 100
Total long-term debt |  | 33,957 | 28,998
Supplemental 364-Day credit facility, variable rate, due 2021 |  | 225 |
Fair value hedge valuation(11) | [4] | $ 3 | 4
Long term debt due within one year |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [2],[5] | 3.14% |
Supplemental 364-Day credit facility, variable rate, due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 1.18% |
Supplemental 364-Day credit facility, variable rate, due 2021 |  | $ 225 |
4.82%, due 2042 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[6] | 4.82% |
Total principal | [6] | $ 331 | 345
Term loans, variable rates, due 2023 and 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[6] | 2.55% |
Total principal | [6] | $ 476 | 527
Senior Notes | Variable rates, due 2020 and 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 0.75% |
Total principal |  | $ 1,000 | 300
Senior Notes | 2.0% to 7.0%, due 2021 to 2049 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[7] | 3.98% |
Total principal | [7] | $ 9,938 | 7,688
Tax-Exempt Financings | Variable Rate Due 2038 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[8] | 0.13% |
Total principal | [8] | $ 35 | 35
Tax-Exempt Financings | GENCO variable rate due 2038 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[8] | 0.13% |
Total principal | [8] | $ 33 | 33
Tax-Exempt Financings | 3.625% and 4.00%, due 2028 and 2033 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[8] | 3.90% |
Total principal | [8] | $ 54 | 54
Tax-Exempt Financings | Other |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[8] | 3.67% |
Total principal | [8] | $ 1 | 1
Tax-Exempt Financings | Tax-Exempt Financing, 1.7% due 2033 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 1.70% |
Total principal |  | $ 27 | 27
Unsecured Junior Subordinated Notes | 2.579% to 4.104%, due 2019 to 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[9] | 3.23% |
Total principal | [9] | $ 1,950 | 2,950
Unsecured Junior Subordinated Notes | 8.4% due 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 8.40% |
Total principal |  | $ 10 | 10
Enhanced Junior Subordinated Notes | Variable rates, due 2066 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal | [10] |  | 397
Enhanced Junior Subordinated Notes | 5.25% and 5.75%, due 2054 and 2076 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 5.48% |
Total principal |  | $ 1,485 | 1,485
Questar Gas | 2.98% to 7.20%, due 2024 to 2051 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 4.25% |
Total principal |  | $ 750 | 750
East Ohio | 1.30% to 3.00%, due 2025 to 2050 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 2.25% |
Total principal |  | $ 1,800 |
SCANA | 4.125% to 6.25%, due 2020 to 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal | [11] |  | 508
SCANA | Unsecured Senior Notes, variable rate, due 2034 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal | [12] |  | 66
PSNC | 4.05% to 7.45%, due 2020 to 2047 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 4.62% |
Total principal |  | $ 800 | 700
DESC | First mortgage bonds, 3.22% to 6.625%, due 2021 to 2065 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 5.42% |
Total principal |  | $ 3,267 | $ 3,267
Virginia Electric and Power Company |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates |  | 0.30% | 2.10%
Total principal |  | $ 13,314 | $ 12,414
Securities due within one year |  |  | (1)
Unamortized discount, premium and debt issuances costs, net |  | (107) | (88)
Derivative restructuring |  | 444 |
Finance leases | [3] | 36 | 16
Total long-term debt |  | $ 13,687 | 12,341
Virginia Electric and Power Company | Senior Notes | 2.45% to 8.875%, due 2022 to 2050 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5],[13] | 4.14% |
Total principal |  | $ 12,689 | 11,789
Virginia Electric and Power Company | Tax-Exempt Financings | 0.45% to 1.90%, due 2032 to 2041 |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average percentage interest rates | [5] | 1.14% |
Total principal | [13] | $ 625 | $ 625
[1] | Excludes amounts classified as held for sale. See Note 3.
[2] | Includes $22 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.
[3] | Included in other long-term debt in the Companies’ Consolidated Balance Sheets.
[4] | Represents the valuation of certain fair value hedges associated with Dominion Energy’s fixed rate debt.
[5] | Represents weighted-average coupon rates for debt outstanding as of December 31, 2020.
[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.
[7] | Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.
[8] | Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2021.
[9] | 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.
[10] | 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 current liabilities in Dominion Energy’s Consolidated Balance Sheets at December 31, 2019.
[11] | 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.
[12] | 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.
[13] | These financings relate to certain pollution control equipment at Virginia Power’s generating facilities.

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