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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
($ millions)2023 2022 
Balance, beginning of year12,464 11,720 
Disposition of Aitken Creek (Note 21)
(27)— 
Foreign currency translation impacts (1)
(253)744 
Balance, end of year12,184 12,464 
(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