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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | $ 3,294 | $ 3,044 |
Goodwill, Ending Balance | [1] | 6,399 | 3,294 |
DCG |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition |  |  | 250 |
Dominion Questar Corporation |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition |  | 3,105 |  |
Operating Segments | Dominion Generation |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 1,422 | 1,422 | [2]
Goodwill, Ending Balance | [1] | 1,422 | 1,422 |
Operating Segments | Dominion Generation | DCG |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition |  |  | 0 |
Operating Segments | Dominion Generation | Dominion Questar Corporation |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition |  | 0 |  |
Operating Segments | Dominion Energy |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 946 | 696 | [2]
Goodwill, Ending Balance | [1] | 4,051 | 946 |
Operating Segments | Dominion Energy | DCG |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition | [3] |  | 250 |
Operating Segments | Dominion Energy | Dominion Questar Corporation |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition | [3] | 3,105 |  |
Operating Segments | DVP |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 926 | 926 |
Goodwill, Ending Balance | [1] | 926 | 926 |
Operating Segments | DVP | DCG |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition |  |  | 0 |
Operating Segments | DVP | Dominion Questar Corporation |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition |  | 0 |  |
Operating Segments | Corporate and Other |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1],[4] | 0 | 0 |
Goodwill, Ending Balance | [1],[4] | 0 | 0 |
Operating Segments | Corporate and Other | DCG |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition | [4] |  | 0 |
Operating Segments | Corporate and Other | Dominion Questar Corporation |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition | [4] | 0 |  |
Dominion Gas Holdings, LLC |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 542 | 542 |
No events affecting goodwill |  | 0 | 0 |
Goodwill, Ending Balance | [1] | 542 | 542 |
Dominion Gas Holdings, LLC | Operating Segments | Dominion Generation |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 0 | 0 |
No events affecting goodwill |  | 0 | 0 |
Goodwill, Ending Balance | [1] | 0 | 0 |
Dominion Gas Holdings, LLC | Operating Segments | Dominion Energy |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 542 | 542 |
No events affecting goodwill |  | 0 | 0 |
Goodwill, Ending Balance | [1] | 542 | 542 |
Dominion Gas Holdings, LLC | Operating Segments | DVP |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 0 | 0 |
No events affecting goodwill |  | 0 | 0 |
Goodwill, Ending Balance | [1] | 0 | 0 |
Dominion Gas Holdings, LLC | Operating Segments | Corporate and Other |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1],[4] | 0 | 0 |
No events affecting goodwill | [4] | 0 | 0 |
Goodwill, Ending Balance | [1],[4] | $ 0 | $ 0 |
[1] | Goodwill amounts do not contain any accumulated impairment losses.
[2] | Recast to reflect nonregulated retail energy marketing operations in the Dominion Energy segment.
[3] | See Note 3 for discussion of Dominion's acquisitions.
[4] | Goodwill recorded at the Corporate and Other segment is allocated to the primary operating segments for goodwill impairment testing purposes.

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