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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net Income from continuing operations |  |  |  |  |  |  |  |  |  | $ 1,583 | $ 653 | $ 2,087
Preferred stock dividends (see Note 19) |  |  |  |  |  |  |  |  |  | (65) | (17) |
Net income attributable to Dominion Energy from continuing operations - Basic |  |  |  |  |  |  |  |  |  | 1,518 | 636 | 2,087
Dilutive effect of Series A Preferred Stock |  |  |  |  |  |  |  |  |  | (11) | (28) |
Net income attributable to Dominion Energy from continuing operations - Diluted |  |  |  |  |  |  |  |  |  | 1,507 | 608 | 2,087
Net Income (Loss) from discontinued operations |  |  |  |  |  |  |  |  |  | $ (1,984) | $ 705 | $ 360
Average shares of common stock outstanding – Basic |  |  |  |  |  |  |  |  |  | 831.0 | 808.8 | 654.2
Net effect of dilutive securities | [1] |  |  |  |  |  |  |  |  |  | 0.1 | 0.7
Average shares of common stock outstanding – Diluted |  |  |  |  |  |  |  |  |  | 831.0 | 808.9 | 654.9
EPS from continuing operations - Basic |  | $ 0.98 | $ 0.42 | $ 1.01 | $ (0.57) | $ 0.99 | $ 1.14 | $ (0.25) | $ (1.14) | $ 1.83 | $ 0.79 | $ 3.19
EPS from discontinued operations - Basic |  | (0.16) | (0.01) | (2.42) | 0.23 | 0.22 | 0.05 | 0.32 | 0.28 | (2.39) | 0.87 | 0.55
EPS attributable to Dominion Energy - Basic |  | 0.82 | 0.41 | (1.41) | (0.34) | 1.21 | 1.19 | 0.07 | (0.86) | (0.56) | 1.66 | 3.74
EPS from continuing operations - Diluted |  | 0.98 | 0.42 | 0.90 | (0.57) | 0.99 | 1.12 | (0.25) | (1.14) | 1.82 | 0.75 | 3.19
EPS from discontinued operations - Diluted |  | (0.16) | (0.01) | (2.42) | 0.23 | 0.22 | 0.05 | 0.32 | 0.28 | (2.39) | 0.87 | 0.55
EPS attributable to Dominion Energy - Diluted |  | $ 0.82 | $ 0.41 | $ (1.52) | $ (0.34) | $ 1.21 | $ 1.17 | $ 0.07 | $ (0.86) | $ (0.57) | $ 1.62 | $ 3.74
[1] | Dilutive securities for 2018 consist primarily of forward sale agreements, effective April 2018 to December 2018. See Note 20 for more information.

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