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REGULATORY MATTERS - Schedule of Regulatory Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Regulatory Assets [Line Items]    
Regulatory assets (Note 7) $ 259 $ 232
Noncurrent regulatory assets 5,606 5,397
Regulatory assets 5,865 5,629
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 106 270
Noncurrent regulatory liabilities 3,321 3,124
Regulatory liabilities 3,427 3,394
Purchased gas variance    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 0 153
Other Regulatory Assets (Liabilities)    
Regulatory Liabilities [Line Items]    
Current regulatory liabilities 106 117
Noncurrent regulatory liabilities 234 150
Future removal and restoration costs    
Regulatory Liabilities [Line Items]    
Noncurrent regulatory liabilities 1,543 1,455
U.S income Taxes    
Regulatory Liabilities [Line Items]    
Noncurrent regulatory liabilities 895 941
Pipeline future abandonment costs    
Regulatory Liabilities [Line Items]    
Noncurrent regulatory liabilities 649 578
Purchase gas variance    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 215 0
Under-recovery of fuel costs    
Regulatory Assets [Line Items]    
Regulatory assets (Note 7) 114 86
Deferred income taxes    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 4,176 3,890
Long-term debt    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 398 429
Pension plans and OPEB    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 78 402
Negative salvage    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 243 246
Accounting policy changes    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 157 169
Other Regulatory Assets (Liabilities)    
Regulatory Assets [Line Items]    
Regulatory assets (Note 7) 145 146
Noncurrent regulatory assets $ 339 $ 261