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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to Dominion Energy from continuing operations $ 1,006 $ 949 $ 2,431 $ 1,700
Preferred stock dividends (see Note 16) (11) (15) (33) (54)
Preferred stock deemed dividends (see Note 16) 0 0 0 (9)
Net income attributable to Dominion Energy from continuing operations - Basic 995 934 2,398 1,637
Net income attributable to Dominion Energy from continuing operations - Diluted 995 934 2,398 1,637
Net income (loss) attributable to Dominion Energy from discontinued operations - Basic & Diluted $ 0 $ (15) $ 0 $ 200
Average shares of common stock outstanding – Basic 853.5 839.0 852.8 838.3
Net effect of dilutive securities [1] 1.9 0.3 0.8 0.1
Average shares of common stock outstanding – Diluted 855.4 839.3 853.6 838.4
EPS from continuing operations – Basic $ 1.17 $ 1.11 $ 2.81 $ 1.95
EPS from discontinued operations – Basic 0 (0.02) 0 0.24
Net income attributable to Dominion Energy 1.17 1.09 2.81 2.19
EPS from continuing operations – Diluted 1.16 1.11 2.81 1.95
EPS from discontinued operations – Diluted 0 (0.02) 0 0.24
Net income attributable to Dominion Energy $ 1.16 $ 1.09 $ 2.81 $ 2.19
[1] Dilutive securities for three months ended September 30, 2025 consists of forward sales agreements entered into in the first, second and third quarters of 2025 and the third and fourth quarters of 2024 (applying the treasury stock method). Dilutive securities for nine months ended September 30, 2025 consists of forward sales agreement entered into the second and third quarters of 2025 and certain forward sales agreements entered into in the first quarter of 2025 and the third and fourth quarters of 2024 (applying the treasury stock method). Additionally, dilutive securities for the three and nine months ended September 30, 2024 consists of certain of the forward sales agreements entered into in the second and third quarters of 2024 (applying the treasury stock method). See Note 16 for additional information.