v3.24.0.1
Intangible Assets
12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets INTANGIBLE ASSETS
AccumulatedNet Book
($ millions)
CostAmortizationValue
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 
2022
Computer software985 (497)488 
Land, transmission and water rights1,064 (171)893 
Other135 (78)57 
Assets under construction110 — 110 
2,294 (746)1,548 

Included in the cost of land, transmission and water rights as at December 31, 2023 was $113 million (2022 - $117 million) not subject to amortization. Amortization expense was $150 million for 2023 (2022 - $145 million). Amortization is estimated to average approximately $88 million for each of the next five years.