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Regulatory Assets and Liabilities (Regulated Liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current $ 495 $ 290
Regulatory Liability, Long-term 1,778 1,765
Total regulatory liabilities 2,273 2,055
Accumulated reserve - cost of removal    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 895 819
Deferred income tax regulatory liabilities    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 877 863
Deferrals related to derivative instruments    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 230 241
NMGC gas hedge settlements    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 162 0
Cost Recovery Clauses    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 70 35
Self-insurance fund (note 32)    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 30 28
Storm reserve    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 0 58
Other    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities $ 9 $ 11