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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.