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Other Assets (Tables)
12 Months Ended
Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Assets
($ millions)2024 2023 
Employee future benefits (Note 24)551 355 
Equity investments (1)
259 237 
Other investments225 180 
RECs (Note 8)
176 155 
Supplemental Executive Retirement Plan ("SERP")127 117 
Operating leases (Note 15)64 51 
Derivatives48 43 
Deferred compensation plan29 22 
Other174 138 
1,653 1,298 
(1)    Includes investments in Belize Electricity and Wataynikaneyap Power