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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] | 542 | 542
Purchase Accounting Adjustment |  | 5 |
No events affecting goodwill |  |  | 0
Goodwill, Ending Balance | [1] | 547 | 542
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 |  |  | 0
Operating Segments | Dominion Energy Gas Holdings, LLC | Gas Infrastructure |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 542 | 542
Purchase Accounting Adjustment |  | 5 |
No events affecting goodwill |  |  | 0
Goodwill, Ending Balance | [1] | $ 547 | 542
Operating Segments | Dominion Energy Gas Holdings, LLC | Power Delivery |  |  |
Goodwill [Roll Forward] |  |  |
No events affecting goodwill |  |  | 0
Operating Segments | Dominion Energy Gas Holdings, LLC | Corporate and Other |  |  |
Goodwill [Roll Forward] |  |  |
No events affecting goodwill | [3] |  | $ 0
[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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