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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Schedule of Property Plant and Equipment | The service life ranges and weighted average remaining service life of PPE 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
Distribution |  |  |  |  |
Electric | 5-80 | 32 |  | 5-80 | 31
Gas | 18-83 | 37 |  | 18-95 | 38
Transmission |  |  |  |  |
Electric | 20-85 | 42 |  | 20-90 | 41
Gas | 10-80 | 35 |  | 10-85 | 36
Generation | 2-95 | 22 |  | 2-95 | 23
Other | 3-80 | 13 |  | 3-80 | 10
($ millions) | Cost |  | Accumulated Depreciation |  | Net Book Value
2024 |  |  |  |  |
Distribution |  |  |  |  |
Electric | 15,771 |  |  | (4,078) |  |  | 11,693 |
Gas | 7,148 |  |  | (1,866) |  |  | 5,282 |
Transmission |  |  |  |  |
Electric | 23,084 |  |  | (4,865) |  |  | 18,219 |
Gas | 2,937 |  |  | (894) |  |  | 2,043 |
Generation | 8,056 |  |  | (3,110) |  |  | 4,946 |
Other | 5,014 |  |  | (1,809) |  |  | 3,205 |
Assets under construction | 3,578 |  |  | — |  |  | 3,578 |
Land | 490 |  |  | — |  |  | 490 |
|  | 66,078 |  |  | (16,622) |  |  | 49,456 |
2023 |
Distribution |  |  |  |  |
Electric | 14,352 |  |  | (3,708) |  |  | 10,644 |
Gas | 6,682 |  |  | (1,736) |  |  | 4,946 |
Transmission |  |  |  |  |
Electric | 19,886 |  |  | (4,267) |  |  | 15,619 |
Gas | 2,751 |  |  | (843) |  |  | 1,908 |
Generation | 7,192 |  |  | (2,739) |  |  | 4,453 |
Other | 4,444 |  |  | (1,645) |  |  | 2,799 |
Assets under construction | 2,581 |  |  | — |  |  | 2,581 |
Land | 435 |  |  | — |  |  | 435 |
|  | 58,323 |  |  | (14,938) |  |  | 43,385 |
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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