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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net income from continuing operations $ 589 $ 369 $ 1,828 $ 767
Preferred stock dividends (see Note 16) (16) (16) (48) (48)
Net income attributable to Dominion Energy from continuing operations – Basic 573 353 1,780 719
Dilutive effect of Series A Preferred Stock       (28)
Net income attributable to Dominion Energy from continuing operations - Diluted 573 353 1,780 691
Net income (loss) from discontinued operations $ 65 $ (13) $ 119 $ (1,850)
Average shares of common stock outstanding – Basic 808.7 833.8 807.1 837.1
Net effect of dilutive securities [1] 1.3   0.5  
Average shares of common stock outstanding – Diluted 810.0 833.8 807.6 837.1
EPS from continuing operations – Basic $ 0.71 $ 0.42 $ 2.20 $ 0.86
EPS from discontinued operations – Basic 0.08 (0.01) 0.15 (2.21)
EPS attributable to Dominion Energy – Basic 0.79 0.41 2.35 (1.35)
EPS from continuing operations – Diluted 0.71 0.42 2.20 0.83
EPS from discontinued operations – Diluted 0.08 (0.01) 0.15 (2.21)
EPS attributable to Dominion Energy – Diluted $ 0.79 $ 0.41 $ 2.35 $ (1.38)
[1]

Primarily related to shares expected to be issued to settle litigation.