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Other Liabilities - Schedule of Other Liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
mine
Dec. 31, 2020
Dec. 31, 2022
CAD ($)
Other Commitments [Line Items]      
Employee future benefits (Note 24) $ 527   $ 423
Customer and other deposits 168   107
AROs (Note 3) 163   174
Manufactured gas plant site remediation 94   95
Stock-based compensation plans (Note 20) 82   79
Deferred compensation plan (Note 9) 54   48
Derivatives (Note 26) 48   72
Operating leases (Note 15) 39   34
Mine reclamation obligations 30   39
Retail energy contract 27   33
Other 38   42
Other liabilities $ 1,270   $ 1,146
TEP | Coal Mine Reclamation      
Other Commitments [Line Items]      
Number of mines | mine 2    
Environmental exit costs, estimated reclamation costs $ 41    
FortisAlberta      
Other Commitments [Line Items]      
Retail energy contract period   8 years