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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Supplementary Cash Flow Information [Line Items]      
Accounts Receivable and Accrued Revenues $ 838 $ (953) $ 77
Income Tax Receivable (58) (1) (12)
Inventories (143) (1,646) 450
Accounts Payable and Accrued Liabilities (524) 1,645 (338)
Income Tax Payable 1,000 87 (17)
Total Change in Non-Cash Working Capital 1,113 (868) 160
Net Change in Non-Cash Working Capital – Operating Activities 575 (1,227) 198
Net Change in Non-Cash Working Capital – Investing Activities 538 359 (38)
Interest Paid 647 811 381
Interest Received 78 24 5
Income Taxes Paid $ 723 $ 209 $ 18