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Goodwill and Intangible Assets (Goodwill) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning Balance | [1] | $ 6,405 |  | $ 6,399 |
Purchase Accounting Adjustment |  | 5 |  |  |
Dominion Questar Combination |  |  |  | 6 |
Goodwill, Ending Balance | [1] | 6,410 |  | 6,405 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning Balance |  | 1,466 |  | 1,466 | [1]
Purchase Accounting Adjustment |  | 5 |  |  |
No events affecting goodwill |  |  |  |  |
Goodwill, Ending Balance |  | 1,471 | [1] | 1,466 |
Operating Segments | Power Generation |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning Balance | [1] | 1,422 |  | 1,422 |
Goodwill, Ending Balance | [1] | 1,422 |  | 1,422 |
Operating Segments | Gas Infrastructure |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning Balance | [1] | 4,057 |  | 4,051 |
Purchase Accounting Adjustment |  | 5 |  |  |
Dominion Questar Combination | [2] |  |  | 6 |
Goodwill, Ending Balance | [1] | 4,062 |  | 4,057 |
Operating Segments | Power Delivery |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning Balance | [1] | 926 |  | 926 |
Goodwill, Ending Balance | [1] | 926 |  | 926 |
Operating Segments | Dominion Energy Gas Holdings, LLC | Power Generation |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
No events affecting goodwill |  |  |  |  |
Operating Segments | Dominion Energy Gas Holdings, LLC | Gas Infrastructure |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning Balance | [1] |  |  | 1,466 |
Purchase Accounting Adjustment |  | 5 |  |  |
No events affecting goodwill |  |  |  |  |
Goodwill, Ending Balance | [1] | $ 1,471 |  |  |
Operating Segments | Dominion Energy Gas Holdings, LLC | Power Delivery |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
No events affecting goodwill |  |  |  |  |
Operating Segments | Dominion Energy Gas Holdings, LLC | Corporate and Other |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
No events affecting goodwill | [3] |  |  |  |
[1] | Goodwill amounts do not contain any accumulated impairment losses.
[2] | See Note 3.
[3] | Goodwill recorded at the Corporate and Other segment is allocated to the primary operating segments for goodwill impairment testing purposes.

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