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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Indefinite-Lived 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 |
Schedule of Intangible Assets | The service life ranges and weighted average remaining service life of finite-life intangible assets as at December 31 were as follows.
|  | 2024 |  | 2023
(years) | Service Life Ranges | Weighted Average Remaining Service Life |  | Service Life Ranges | Weighted Average Remaining Service Life
Computer software | 3-18 | 5 |  | 3-18 | 5
Land, transmission and water rights | 30-85 | 52 |  | 30-90 | 52
Other | 10-100 | 16 |  | 10-100 | 14
|  |  | 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 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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