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Intangible Assets
12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets INTANGIBLE ASSETS
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 

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.