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Goodwill and Intangible Assets (Goodwill) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | $ 6,410 | $ 6,405
Purchase Accounting Adjustment |  |  | 5
SCANA Combination | [2] | 2,609 |
Contribution of SEMI to Wrangler | [3] | (73) |
Goodwill, Ending Balance | [1] | 8,946 | 6,410
Dominion Energy Gas Holdings, LLC |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 1,471 | 1,466
Purchase Accounting Adjustment |  |  | 5
No events affecting goodwill |  | 0 |
Goodwill, Ending Balance | [1] | 1,471 | 1,471
Dominion Energy Gas Holdings, LLC | Dominion Energy Virginia |  |  |
Goodwill [Roll Forward] |  |  |
No events affecting goodwill |  | 0 |
Dominion Energy Gas Holdings, LLC | Gas & Transportation |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 1,471 | 1,466
Purchase Accounting Adjustment |  |  | 5
No events affecting goodwill |  | 0 |
Goodwill, Ending Balance | [1] | 1,471 | 1,471
Dominion Energy Gas Holdings, LLC | Gas Distribution |  |  |
Goodwill [Roll Forward] |  |  |
No events affecting goodwill |  | 0 |
Dominion Energy Gas Holdings, LLC | Dominion Energy South Carolina [Member] |  |  |
Goodwill [Roll Forward] |  |  |
No events affecting goodwill |  | 0 |
Dominion Energy Gas Holdings, LLC | Contracted Generation |  |  |
Goodwill [Roll Forward] |  |  |
No events affecting goodwill |  | 0 |
Dominion Energy Gas Holdings, LLC | Corporate and Other |  |  |
Goodwill [Roll Forward] |  |  |
No events affecting goodwill |  | 0 |
Operating Segments | Dominion Energy Virginia |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 2,106 | 2,106
Goodwill, Ending Balance | [1] | 2,106 | 2,106
Operating Segments | Gas & Transportation |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 1,565 | 1,561
Purchase Accounting Adjustment |  |  | 4
SCANA Combination | [2] | 73 |
Contribution of SEMI to Wrangler | [3] | (73) |
Goodwill, Ending Balance | [1] | 1,565 | 1,565
Operating Segments | Gas Distribution |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 2,497 | 2,496
Purchase Accounting Adjustment |  |  | 1
SCANA Combination | [2] | 1,015 |
Goodwill, Ending Balance | [1] | 3,512 | 2,497
Operating Segments | Dominion Energy South Carolina [Member] |  |  |
Goodwill [Roll Forward] |  |  |
SCANA Combination | [2] | 1,521 |
Goodwill, Ending Balance | [1] | 1,521 |
Operating Segments | Contracted Generation |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 242 | 242
Goodwill, Ending Balance | [1] | $ 242 | $ 242
[1] | Goodwill amounts do not contain any accumulated impairment losses.
[2] | See Note 3 for discussion of Dominion Energy’s acquisitions.
[3] | See Note 9 for additional information.

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