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Commitments and Contingencies - Future Payments for Commitments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage $ 30,986   $ 21,397
Real Estate 908   797
Obligation to Fund Equity-Accounted Affiliate 642    
Other Long-Term Commitments 2,310   325
Contractual commitments 34,846   22,519
Transportation commitments $ 8,100   14,000
Transportation Commitments Subject To Regulatory Approval Or Approved But Not Yet In Service Term 20 years    
Arrangement      
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage   $ 7,400  
Contractual commitments   17,600  
Commitments approved and not yet in service | Arrangement      
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage   $ 1,700  
1 Year      
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage $ 3,288   1,014
Real Estate 44   34
Obligation to Fund Equity-Accounted Affiliate 68    
Other Long-Term Commitments 509   105
Contractual commitments 3,909   1,153
2 Years      
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage 3,567   954
Real Estate 43   36
Obligation to Fund Equity-Accounted Affiliate 85    
Other Long-Term Commitments 156   47
Contractual commitments 3,851   1,037
3 Years      
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage 3,373   1,341
Real Estate 52   38
Obligation to Fund Equity-Accounted Affiliate 99    
Other Long-Term Commitments 145   32
Contractual commitments 3,669   1,411
4 Years      
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage 2,146   1,444
Real Estate 54   41
Obligation to Fund Equity-Accounted Affiliate 90    
Other Long-Term Commitments 136   32
Contractual commitments 2,426   1,517
5 Years      
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage 2,012   1,107
Real Estate 57   44
Obligation to Fund Equity-Accounted Affiliate 90    
Other Long-Term Commitments 150   24
Contractual commitments 2,309   1,175
Thereafter      
Disclosure Of Commitments And Contingent Liabilities [Line Items]      
Transportation and Storage 16,600   15,537
Real Estate 658   604
Obligation to Fund Equity-Accounted Affiliate 210    
Other Long-Term Commitments 1,214   85
Contractual commitments $ 18,682   $ 16,226