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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Segment allocation of goodwill | The changes in Dominion Energy’s and Dominion Energy Gas’ carrying amount and segment allocation of goodwill are presented below:
|  | Power Generation |  |  | Gas Infrastructure |  |  | Power Delivery |  |  | Corporate and Other(1) |  |  | Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2015(2) |  |  | $1,422 |  |  |  | $ 946 |  |  |  | $926 |  |  |  | $— |  |  |  | $3,294 |
Dominion Energy Questar Combination |  |  | — |  |  |  | 3,105 | (3) |  |  | — |  |  |  | — |  |  |  | 3,105 |
Balance at December 31, 2016(2) |  |  | $1,422 |  |  |  | $4,051 |  |  |  | $926 |  |  |  | $— |  |  |  | $6,399 |
Dominion Energy Questar Combination |  |  | — |  |  |  | 6 | (3) |  |  | — |  |  |  | — |  |  |  | 6 |
Balance at December 31, 2017(2) |  |  | $1,422 |  |  |  | $4,057 |  |  |  | $926 |  |  |  | $— |  |  |  | $6,405 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2015(2) |  |  | $ — |  |  |  | $ 542 |  |  |  | $ — |  |  |  | $— |  |  |  | $ 542 |
No events affecting goodwill |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance at December 31, 2016(2) |  |  | $ — |  |  |  | $ 542 |  |  |  | $ — |  |  |  | $— |  |  |  | $ 542 |
No events affecting goodwill |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance at December 31, 2017(2) |  |  | $ — |  |  |  | $ 542 |  |  |  | $ — |  |  |  | $— |  |  |  | $ 542 |
(1) | Goodwill recorded at the Corporate and Other segment is allocated to the primary operating segments for goodwill impairment testing purposes.
(2) | Goodwill amounts do not contain any accumulated impairment losses.
(3) | See Note 3.
Components of intangible assets | The components of intangible assets are as follows:
|  | 2017 |  |  | 2016 |
At December 31, |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software, licenses and other |  |  | $1,043 |  |  |  | $358 |  |  |  | $955 |  |  |  | $337 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software, licenses and other |  |  | $ 347 |  |  |  | $114 |  |  |  | $326 |  |  |  | $101 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software, licenses and other |  |  | $ 165 |  |  |  | $ 56 |  |  |  | $147 |  |  |  | $ 49 |
Annual amortization expense of intangible assets | Annual amortization expense for these intangible assets is estimated to be as follows:
|  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  | $ | 78 |  |  | $ | 68 |  |  | $ | 56 |  |  | $ | 43 |  |  | $ | 37 |
Virginia Power |  | $ | 30 |  |  | $ | 26 |  |  | $ | 20 |  |  | $ | 13 |  |  | $ | 9 |
Dominion Energy Gas |  | $ | 13 |  |  | $ | 13 |  |  | $ | 12 |  |  | $ | 11 |  |  | $ | 10 |

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