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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Segment allocation of goodwill | The changes in Dominion Energy’s carrying amount and segment allocation of goodwill are presented below:
|  | Dominion Energy Virginia |  |  | Gas Distribution |  |  | Dominion Energy South Carolina |  |  | Contracted Assets |  |  | Corporate and Other |  | Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2018(1) |  | $ | 2,106 |  |  | $ | 2,497 |  |  | $ | — |  |  | $ | 242 |  |  | $ | 14 |  | $ | 4,859 |
SCANA Combination (2) |  |  | — |  |  |  | 1,015 |  |  |  | 1,521 |  |  |  | — |  |  |  | 73 |  |  | 2,609 |
Contribution of SEMI to Wrangler(3) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (73 | ) |  | (73 | )
Balance at December 31, 2019(1) |  | $ | 2,106 |  |  | $ | 3,512 |  |  | $ | 1,521 |  |  | $ | 242 |  |  | $ | 14 |  | $ | 7,395 |
Contribution to Wrangler(3) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (14 | ) |  | (14 | )
Balance at December 31, 2020(1) |  | $ | 2,106 |  |  | $ | 3,512 |  |  | $ | 1,521 |  |  | $ | 242 |  |  | $ | — |  | $ | 7,381 |
(1) Goodwill amounts do not contain any accumulated impairment losses. (2) See Note 3 for more information on the SCANA Combination. As a result of the December 2019 segment realignment, the acquired goodwill was reassigned using a relative fair value approach. (3) See Note 9 for additional information including amounts reclassified to held for sale at December 31, 2020.
Components of intangible assets | The components of intangible assets are as follows:
|  | 2020 |  |  | 2019 |
At December 31, |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software, licenses and other |  | $ | 1,295 |  |  | $ | 530 |  |  | $ | 1,162 |  |  | $ | 477 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software, licenses and other |  | $ | 482 |  |  | $ | 148 |  |  | $ | 406 |  |  | $ | 135 |
Annual amortization expense of intangible assets | Annual amortization expense for these intangible assets is estimated to be as follows:
|  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  | $ | 77 |  | $ | 56 |  | $ | 42 |  | $ | 34 |  | $ | 26 |
Virginia Power |  | $ | 32 |  | $ | 18 |  | $ | 12 |  | $ | 9 |  | $ | 6 |

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