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Preferred Stock (Schedule of Equity Units) (Detail) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 14, 2019 | Sep. 30, 2020 | Aug. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2020
Capital Unit [Line Items] |  |  |  |  |  |
Units Issued |  |  | 4.1 | 18.5 | 6.1 |
Total Preferred Stock |  |  |  |  | $ 2,387 | $ 2,387
Stock Purchase Contract Liability |  |  |  |  | $ 212 | $ 129
Preferred Stock |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |
Units Issued |  |  |  |  | 2.0 |
Preferred Stock | 2019 Series A Corporate Units |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |
Units Issued |  | 16.0 |  |  |  |
Total Net Proceeds | [1] | $ 1,582 |  |  |  |
Total Preferred Stock | [2] | $ 1,610 |  |  |  |
Cumulative Dividend Rate |  | 1.75% |  |  |  |
Stock Purchase Contract Annual Rate |  | 5.50% |  |  |  |
Stock Purchase Contract Liability | [3] | $ 250 |  |  |  |
Stock Purchase Contract Settlement Date |  | Jun. 01, 2022 |  |  |  |
[1] | Issuance costs of $28 million were recorded as a reduction to preferred stock ($14 million) and common stock ($14 million) in the Consolidated Balance Sheets at December 31, 2019.
[2] | Dominion Energy recorded dividends of $28 million ($17.50 per share) and $15 million ($9.479 per share) for the years ended December 31, 2020 and 2019, respectively.
[3] | Payments of $83 million and $38 million were made in 2020 and 2019, respectively. The stock purchase contract liability was $129 million and $212 million at December 31, 2020 and 2019, respectively.

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