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Goodwill And Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Segment allocation of goodwill | The changes in Dominion's and Dominion Gas' carrying amount and segment allocation of goodwill are presented below:
| Dominion Generation |  |  | Dominion Energy |  |  | DVP |  |  | Corporate and Other(1) |  |  | Total |
(millions) |  |  |  |  |  |  |  |  |
Dominion |  |  |  |  |  |  |  |  |
Balance at December 31, 2014(2) | $ | 1,422 |  | (3) | $ | 696 |  | (3) | $ | 926 |  |  | $ | — |  |  | $ | 3,044 |
DCG acquisition | — |  |  | 250 |  | (4) | — |  |  | — |  |  | 250 |
Balance at December 31, 2015(2) | $ | 1,422 |  |  | $ | 946 |  |  | $ | 926 |  |  | $ | — |  |  | $ | 3,294 |
Dominion Questar Combination | — |  |  | 3,105 |  | (4) | — |  |  | — |  |  | 3,105 |
Balance at December 31, 2016(2) | $ | 1,422 |  |  | $ | 4,051 |  |  | $ | 926 |  |  | $ | — |  |  | $ | 6,399 |
Dominion Gas |  |  |  |  |  |  |  |  |
Balance at December 31, 2014(2) | $ | — |  |  | $ | 542 |  |  | $ | — |  |  | $ | — |  |  | $ | 542 |
No events affecting goodwill | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at December 31, 2015(2) | $ | — |  |  | $ | 542 |  |  | $ | — |  |  | $ | — |  |  | $ | 542 |
No events affecting goodwill | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at December 31, 2016(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) | Recast to reflect nonregulated retail energy marketing operations in the Dominion Energy segment.
(4) | See Note 3 for discussion of Dominion's acquisitions.
Components of intangible assets | The components of intangible assets are as follows:
At December 31, | 2016 | 2015
| Gross Carrying Amount | Accumulated Amortization | Gross Carrying Amount | Accumulated Amortization
(millions) |  |  |  |
Dominion |  |  |  |
Software, licenses and other | $ | 955 |  | $ | 337 |  | $ | 942 |  | $ | 372 |
Total | $ | 955 |  | $ | 337 |  | $ | 942 |  | $ | 372 |
Virginia Power |  |  |  |  |  |  |  |
Software, licenses and other | $ | 326 |  | $ | 101 |  | $ | 301 |  | $ | 88 |
Total | $ | 326 |  | $ | 101 |  | $ | 301 |  | $ | 88 |
Dominion Gas |  |  |  |  |  |  |  |
Software, licenses and other | $ | 147 |  | $ | 49 |  | $ | 211 |  | $ | 128 |
Total | $ | 147 |  | $ | 49 |  | $ | 211 |  | $ | 128 |
Annual amortization expense of intangible assets | Annual amortization expense for these intangible assets is estimated to be as follows:
| 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |
(millions) |  |  |  |  |
Dominion | $ | 78 |  | $ | 67 |  | $ | 57 |  | $ | 45 |  | $ | 32 |
Virginia Power | $ | 29 |  | $ | 25 |  | $ | 22 |  | $ | 16 |  | $ | 9 |
Dominion Gas | $ | 13 |  | $ | 11 |  | $ | 10 |  | $ | 10 |  | $ | 9 |

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