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Commitments and Contingencies - Future Payments for Commitments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage $ 24,260 $ 24,667
Product Purchases 14 617
Real Estate 841 898
Obligation to Fund HCML 512 513
Other Long-Term Commitments 1,653 2,101
Total Commitments $ 27,280 28,796
Transportation commitments subject to regulatory approval or approved but not yet in service term 20 years  
Contractual commitments $ 27,280 28,796
HMLP    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Total Commitments 1,800 2,100
Contractual commitments 1,800 2,100
Commitments approved and not yet in service    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation commitments 854 13,000
1 Year    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 2,122 2,018
Product Purchases 14 617
Real Estate 63 57
Obligation to Fund HCML 104 94
Other Long-Term Commitments 411 417
Total Commitments 2,714 3,203
Contractual commitments 2,714 3,203
2 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 1,947 1,927
Product Purchases 0 0
Real Estate 63 57
Obligation to Fund HCML 105 94
Other Long-Term Commitments 191 194
Total Commitments 2,306 2,272
Contractual commitments 2,306 2,272
3 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 1,921 1,680
Product Purchases 0 0
Real Estate 61 59
Obligation to Fund HCML 98 94
Other Long-Term Commitments 187 184
Total Commitments 2,267 2,017
Contractual commitments 2,267 2,017
4 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 1,904 1,663
Product Purchases 0 0
Real Estate 59 63
Obligation to Fund HCML 56 89
Other Long-Term Commitments 158 175
Total Commitments 2,177 1,990
Contractual commitments 2,177 1,990
5 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 1,815 1,641
Product Purchases 0 0
Real Estate 63 58
Obligation to Fund HCML 44 52
Other Long-Term Commitments 117 166
Total Commitments 2,039 1,917
Contractual commitments 2,039 1,917
Thereafter    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and storage 14,551 15,738
Product Purchases 0 0
Real Estate 532 604
Obligation to Fund HCML 105 90
Other Long-Term Commitments 589 965
Total Commitments 15,777 17,397
Contractual commitments $ 15,777 $ 17,397