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Goodwill and Intangible Assets (Goodwill) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | $ 4,143 | $ 4,253
Sale of Hope | [2] |  | (110)
Goodwill, Ending Balance | [1] | 4,143 | 4,143
Operating Segments | Dominion Energy Virginia |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 2,106 | 2,106
Sale of Hope | [2] |  | 0
Goodwill, Ending Balance | [1] | 2,106 | 2,106
Operating Segments | Dominion Energy South Carolina |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 1,521 | 1,521
Sale of Hope | [2] |  | 0
Goodwill, Ending Balance | [1] | 1,521 | 1,521
Operating Segments | Contracted Energy |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 516 | 516
Sale of Hope | [2] |  | 0
Goodwill, Ending Balance | [1] | 516 | 516
Operating Segments | Corporate and Other |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 0 | 110
Sale of Hope | [2] |  | (110)
Goodwill, Ending Balance | [1] | $ 0 | $ 0
[1] | Goodwill amounts do not contain any accumulated impairment losses.
[2] | See Note 3 for additional information.

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