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Intangible Assets | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | INTANGIBLE ASSETS
|  |  | Accumulated |  | Net Book
($ millions) | Cost |  | Amortization |  | Value
2024 |  |  |  |  |
Computer software | 1,035 |  |  | (493) |  |  | 542 |
Land, transmission and water rights | 1,188 |  |  | (210) |  |  | 978 |
Other | 143 |  |  | (95) |  |  | 48 |
Assets under construction | 93 |  |  | — |  |  | 93 |
| 2,459 |  |  | (798) |  |  | 1,661 |
2023 |  |  |  |  |
Computer software | 1,040 |  |  | (528) |  |  | 512 |
Land, transmission and water rights | 1,071 |  |  | (182) |  |  | 889 |
Other | 132 |  |  | (81) |  |  | 51 |
Assets under construction | 58 |  |  | — |  |  | 58 |
| 2,301 |  |  | (791) |  |  | 1,510 |
Included in the cost of land, transmission and water rights as at December 31, 2024 was $123 million (2023 - $113 million) not subject to amortization. Amortization expense was $153 million for 2024 (2023 - $150 million). Amortization is estimated to average approximately $97 million for each of the next five years.

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