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Earnings Per Share (Calculation of Basic and Diluted EPS) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net income from continuing operations $ 717 $ 626 $ 1,864 $ 261
Preferred stock dividends (see Note 16) (20) (20) (60) (72)
Net income attributable to Dominion Energy from continuing operations - Basic 697 606 1,804 189
Dilutive effect of Series A Preferred Stock [1] 0 0 0 0
Net income attributable to Dominion Energy from continuing operations - Diluted 697 606 1,804 189
Net income attributable to Dominion Energy $ (554) $ 152 $ (105) $ 775
Average shares of common stock outstanding – Basic 836.8 832.6 836.0 820.6
Net effect of dilutive securities [2] 0.0 0.6 0.2 1.1
Average shares of common stock outstanding – Diluted 836.8 833.2 836.2 821.7
EPS from continuing operations – Basic $ 0.83 $ 0.73 $ 2.16 $ 0.23
EPS from discontinued operations – Basic (0.66) 0.18 (0.13) 0.95
Net income attributable to Dominion Energy 0.17 0.91 2.03 1.18
EPS from continuing operations – Diluted 0.83 0.73 2.16 0.23
EPS from discontinued operations – Diluted (0.66) 0.18 (0.13) 0.94
Net income attributable to Dominion Energy $ 0.17 $ 0.91 $ 2.03 $ 1.17
[1] Effective January 2022, diluted net income was no longer reduced by the Series A Preferred Stock dividends.
[2] Dilutive securities for the nine months ended September 30, 2023 and the three and nine months ended September 30, 2022 include stock potentially to be issued to satisfy the obligation under a settlement agreement with the SCDOR (applying the if converted method). See Note 17 for additional information. Additionally, dilutive securities for the nine months ended September 30, 2022 included forward sales agreements entered into in November 2021 (applying the treasury stock method). See Note 20 to the Consolidated Financial Statements in Dominion Energy’s Annual Report on Form 10-K for the year ended December 31, 2022 for additional information.