v3.25.0.1
Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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.
20242023
(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)CostAccumulated DepreciationNet Book Value
2024
Distribution
Electric15,771 (4,078)11,693 
Gas7,148 (1,866)5,282 
Transmission
Electric23,084 (4,865)18,219 
Gas2,937 (894)2,043 
Generation8,056 (3,110)4,946 
Other5,014 (1,809)3,205 
Assets under construction3,578 — 3,578 
Land490 — 490 
66,078 (16,622)49,456 
2023
Distribution
Electric14,352 (3,708)10,644 
Gas6,682 (1,736)4,946 
Transmission
Electric19,886 (4,267)15,619 
Gas2,751 (843)1,908 
Generation7,192 (2,739)4,453 
Other4,444 (1,645)2,799 
Assets under construction2,581 — 2,581 
Land435 — 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.
20242023
(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
AccumulatedNet Book
($ millions)
CostAmortizationValue
2024
Computer software1,035 (493)542 
Land, transmission and water rights1,188 (210)978 
Other143 (95)48 
Assets under construction93 — 93 
2,459 (798)1,661 
2023
Computer software1,040 (528)512 
Land, transmission and water rights1,071 (182)889 
Other132 (81)51 
Assets under construction58 — 58 
2,301 (791)1,510