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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
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net income attributable to Dominion Energy from continuing operations $ 647 $ 323
Preferred stock dividends (see Note 16) (11) (20)
Net income attributable to Dominion Energy from continuing operations - Basic 636 303
Net income attributable to Dominion Energy from continuing operations - Diluted 636 303
Net income (loss) attributable to Dominion Energy from discontinued operations - Basic & Diluted $ (1) $ 118
Average shares of common stock outstanding – Basic 852.2 837.6
Net effect of dilutive securities [1] 0.0 0.0
Average shares of common stock outstanding – Diluted 852.2 837.6
EPS from continuing operations – Basic $ 0.75 $ 0.36
EPS from discontinued operations – Basic 0 0.14
Net income attributable to Dominion Energy 0.75 0.5
EPS from continuing operations – Diluted 0.75 0.36
EPS from discontinued operations – Diluted 0 0.14
Net income attributable to Dominion Energy $ 0.75 $ 0.5
[1] Dilutive securities for 2025 consists of certain forward sales agreements entered into in the fourth quarter of 2024 and first quarter of 2025 (applying the treasury stock method).