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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
($ millions)2024 2023 
Balance, beginning of year12,184 12,464 
Disposition of Aitken Creek (Note 21)
— (27)
Foreign currency translation impacts (1)
928 (253)
Balance, end of year13,112 12,184 
(1)    Relates to the translation of goodwill associated with the acquisitions of ITC, UNS Energy, Central Hudson, Caribbean Utilities and FortisTCI, whose functional currency is the U.S. dollar