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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.