Significant Financing Transactions (Schedule of Equity Units) (Detail) - USD ($) shares in Millions, $ in Millions		Jun. 14, 2019	Sep. 30, 2020	Dec. 31, 2019
Capital Unit [Line Items]
Total Preferred Stock			$ 2,387	$ 2,387	[1]
Stock Purchase Contract Liability			$ 150	$ 212
2019 Corporate Units
Capital Unit [Line Items]
Units Issued		16
Total Net Proceeds	[2]	$ 1,582
Total Preferred Stock	[3]	$ 1,610
Cumulative Dividend Rate		1.75%
Stock Purchase Contract Annual Rate		5.50%
Stock Purchase Contract Liability	[4]	$ 250
Stock Purchase Contract Settlement Date		Jun. 01, 2022

[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

[2] 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.

[3] Dominion Energy recorded dividends of $7 million ($4.375 per share) and $21 million ($13.125 per share) for the three and nine months ended September 30, 2020, respectively.

[4] Payments of $62 million and $17 million were made during the nine months ended September 30, 2020 and 2019, respectively. The stock purchase contract liability was $150 million and $212 million at September 30, 2020 and December 31, 2019, respectively.