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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Disclosure Of Supplementary Cash Flow Information [Line Items]          
Current assets $ 15,321   $ 15,321   $ 11,988
Current Liabilities 8,865   8,865   7,305
Working Capital 6,456   6,456   4,683
Adjusted working capital 6,100   6,100   3,800
Investments in joint ventures accounted for using equity method, current         1,300
Contingent Payment 0   0   236
Accounts Receivable and Accrued Revenues 282 $ (221) (1,627) $ (874)  
Income Tax Receivable 8 4 23 13  
Inventories (505) (406) (1,310) (1,014)  
Accounts Payable and Accrued Liabilities (388) 237 1,159 640  
Income Tax Payable 591 (3) 803 (45)  
Total Non-Cash Working Capital (12) (389) (952) (1,280)  
Net Change in Non-Cash Working Capital - Operating Activities (92) (430) (1,291) (1,332)  
Net Change in Non-Cash Working Capital - Investing Activities 80 $ 41 339 $ 52  
Liabilities Related to Assets Held for Sale $ 119   $ 119   $ 186