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Long-Term Debt (Based on Stated Maturity Dates Rather than Early Redemption Dates that Could be Elected by Instrument Holders) (Detail) $ in Millions | Dec. 31, 2020 USD ($)
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Debt Instrument [Line Items] |  |
2021 | $ 2,110 |
2022 | 1,553 |
2023 | 2,966 |
2024 | 1,564 |
2025 | 2,019 |
Thereafter | 25,284 |
Total | $ 35,496 |
Weighted- average coupon, 2021 | 2.93% |
Weighted- average coupon, 2022 | 2.96% |
Weighted- average coupon, 2023 | 1.98% |
Weighted- average coupon, 2024 | 3.17% |
Weighted- average coupon, 2025 | 3.01% |
Weighted- average coupon, Thereafter | 4.45% |
Unsecured senior notes |  |
Debt Instrument [Line Items] |  |
2021 | $ 550 | [1],[2]
2022 | 1,500 | [1],[2]
2023 | 2,700 | [1],[2]
2024 | 690 | [1],[2]
2025 | 2,000 | [1],[2]
Thereafter | 19,537 | [1],[2]
Total | 26,977 | [1],[2]
Tax-exempt financings |  |
Debt Instrument [Line Items] |  |
Thereafter | 775 |
Total | 775 |
Supplemental 364-Day Credit Facility |  |
Debt Instrument [Line Items] |  |
2021 | 225 |
Total | 225 |
Term loans |  |
Debt Instrument [Line Items] |  |
2021 | 35 | [3]
2022 | 34 | [3]
2023 | 250 | [3]
2024 | 157 | [3]
Total | 476 | [3]
First mortgage bonds |  |
Debt Instrument [Line Items] |  |
2021 | 33 |
Thereafter | 3,234 |
Total | 3,267 |
Secured senior notes |  |
Debt Instrument [Line Items] |  |
2021 | 17 |
2022 | 19 |
2023 | 16 |
2024 | 17 |
2025 | 19 |
Thereafter | 243 |
Total | 331 |
Unsecured junior subordinated notes payable to affiliated trusts |  |
Debt Instrument [Line Items] |  |
Thereafter | 10 |
Total | 10 |
Unsecured Junior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
2021 | 1,250 | [4]
2024 | 700 | [4]
Total | 1,950 | [4]
Enhanced Junior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Thereafter | 1,485 | [5]
Total | 1,485 | [5]
Virginia Electric and Power Company |  |
Debt Instrument [Line Items] |  |
2022 | 750 |
2023 | 700 |
2024 | 350 |
2025 | 350 |
Thereafter | 11,164 |
Total | $ 13,314 |
Weighted- average coupon, 2022 | 3.15% |
Weighted- average coupon, 2023 | 2.75% |
Weighted- average coupon, 2024 | 3.45% |
Weighted- average coupon, 2025 | 3.10% |
Weighted- average coupon, Thereafter | 4.18% |
Virginia Electric and Power Company | Unsecured senior notes |  |
Debt Instrument [Line Items] |  |
2022 | $ 750 |
2023 | 700 |
2024 | 350 |
2025 | 350 |
Thereafter | 10,539 |
Total | 12,689 |
Virginia Electric and Power Company | Tax-exempt financings |  |
Debt Instrument [Line Items] |  |
Thereafter | 625 |
Total | $ 625 |
[1] | 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.
[2] | 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
[3] | Excludes mandatory prepayments associated with SBL Holdco and Dominion Solar Projects III, Inc. based on cash flows in excess of debt service. At December 31, 2020, $22 million of estimated mandatory prepayments due within one year were included in securities due within one year in Dominion Energy’s Consolidated Balance Sheets.
[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] | 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.

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