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Commitments and Contingencies - Future Payments for Commitments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage $ 21,081 $ 21,570
Product purchases 9,358 10,625
Real Estate 856 908
Obligation to Fund Equity-Accounted Affiliate 623 642
Other Long-Term Commitments (4) 1,080 1,101
Total Payments 32,998 34,846
Transportation commitments $ 9,100 8,100
Transportation commitments subject to regulatory approval or approved but not yet in service term 20 years  
1 Year    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage $ 1,747 1,677
Product purchases 1,626 1,684
Real Estate 48 44
Obligation to Fund Equity-Accounted Affiliate 92 68
Other Long-Term Commitments (4) 381 436
Total Payments 3,894 3,909
2 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 2,011 1,958
Product purchases 1,509 1,682
Real Estate 50 43
Obligation to Fund Equity-Accounted Affiliate 105 85
Other Long-Term Commitments (4) 90 83
Total Payments 3,765 3,851
3 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 1,542 1,853
Product purchases 922 1,593
Real Estate 50 52
Obligation to Fund Equity-Accounted Affiliate 96 99
Other Long-Term Commitments (4) 75 72
Total Payments 2,685 3,669
4 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 1,416 1,488
Product purchases 922 731
Real Estate 50 54
Obligation to Fund Equity-Accounted Affiliate 96 90
Other Long-Term Commitments (4) 74 63
Total Payments 2,558 2,426
5 Years    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 1,360 1,350
Product purchases 922 731
Real Estate 54 57
Obligation to Fund Equity-Accounted Affiliate 91 90
Other Long-Term Commitments (4) 65 81
Total Payments 2,492 2,309
Thereafter    
Disclosure Of Commitments And Contingent Liabilities [Line Items]    
Transportation and Storage 13,005 13,244
Product purchases 3,457 4,204
Real Estate 604 658
Obligation to Fund Equity-Accounted Affiliate 143 210
Other Long-Term Commitments (4) 395 366
Total Payments $ 17,604 $ 18,682