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Earnings Per Share (Calculation of Basic and Diluted EPS) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net income from continuing operations $ 2,647 $ 1,583 $ 653
Preferred stock dividends (see Note 19) (68) (65) (17)
Net income attributable to Dominion Energy from continuing operations - Basic 2,579 1,518 636
Dilutive effect of Series A Preferred Stock   (11) (28)
Net income attributable to Dominion Energy from continuing operations - Diluted 2,579 1,507 608
Net income (loss) from discontinued operations $ 641 $ (1,984) $ 705
Average shares of common stock outstanding – Basic 807.8 831.0 808.8
Net effect of dilutive securities [1] 0.7   0.1
Average shares of common stock outstanding – Diluted 808.5 831.0 808.9
EPS from continuing operations - Basic $ 3.19 $ 1.83 $ 0.79
EPS from discontinued operations - Basic 0.79 (2.39) 0.87
Net income (loss) attributable to Dominion Energy 3.98 (0.56) 1.66
EPS from continuing operations - Diluted 3.19 1.82 0.75
EPS from discontinued operations - Diluted 0.79 (2.39) 0.87
Net income (loss) attributable to Dominion Energy $ 3.98 $ (0.57) $ 1.62
[1]

Dilutive securities for 2021 consist primarily of stock expected to be issued to satisfy the obligation under a settlement agreement with the SCDOR (applying the if converted method) as well as forward sales agreements entered into in November 2021 (applying the treasury stock method). See Notes 20 and 23 for additional information.