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Other Liabilities - Schedule of Other Liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
mine
Dec. 31, 2021
Dec. 31, 2023
CAD ($)
Other Commitments [Line Items]      
Employee future benefits (Note 24) $ 446   $ 527
AROs (Note 3) 249   163
Customer and other deposits 128   168
Stock-based compensation plans (Note 20) 113   82
Manufactured gas plant site remediation 101   94
Derivatives (Note 26) 66   48
Deferred compensation plan (Note 9) 63   54
Operating leases (Note 15) 47   39
Mine reclamation obligations 40   30
Retail energy contract 20   27
Other 41   38
Other liabilities $ 1,314   $ 1,270
TEP | Coal Mine Reclamation      
Other Commitments [Line Items]      
Number of mines | mine 2    
Environmental exit costs, estimated reclamation costs $ 49    
FortisAlberta      
Other Commitments [Line Items]      
Retail energy contract period   8 years