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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Earnings Per Share [Abstract] |  |  |  |
Net Income (Loss) from continuing operations | $ 369 | $ 937 | $ 767 | $ (171)
Preferred stock dividends (see Note 16) | (16) | (7) | (48) | (8)
Net income (loss) attributable to Dominion Energy from continuing operations – Basic | 353 | 930 | 719 | (179)
Dilutive effect of Series A Preferred Stock |  | (13) | (28) |
Net income (loss) attributable to Dominion Energy from continuing operations - Diluted | 353 | 917 | 691 | (179)
Net Income (Loss) from discontinued operations | $ (13) | $ 38 | $ (1,850) | $ 520
Average shares of common stock outstanding – Basic & Diluted | 833.8 | 813.0 | 837.1 | 802.9
Average shares of common stock outstanding – Diluted | 833.8 | 813.0 | 837.1 | 802.9
EPS from continuing operations – Basic | $ 0.42 | $ 1.14 | $ 0.86 | $ (0.22)
EPS from discontinued operations – Basic | (0.01) | 0.05 | (2.21) | 0.64
EPS attributable to Dominion Energy – Basic | 0.41 | 1.19 | (1.35) | 0.42
EPS from continuing operations – Diluted | 0.42 | 1.12 | 0.83 | (0.22)
EPS from discontinued operations – Diluted | (0.01) | 0.05 | (2.21) | 0.64
EPS attributable to Dominion Energy – Diluted | $ 0.41 | $ 1.17 | $ (1.38) | $ 0.42

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