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Financial Instruments and Risk Management - Market Risk (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 CAD ($) item $ / bbl | Dec. 31, 2022 CAD ($)
Commodity Price Risk |  |
Financial Instruments and Risk Management |  |
Increase in price per barrel of crude oil | $ / bbl | 10 |
Increase (decrease) in pre-tax earnings for the company's outstanding derivative financial instruments | $ 45 | $ (70)
Foreign Currency Exchange Risk |  |
Financial Instruments and Risk Management |  |
Percentage of strengthening in the Cdn$ relative to the US$ | 1.00% | 1.00%
Gains (losses) on change in value of foreign currency basis spreads, net of tax | $ 31 | $ 100
Variable interest rates | Interest Rate Risk |  |
Financial Instruments and Risk Management |  |
Increase in interest rates | 1.00% | 1.00%
Increase (decrease) in pre-tax earnings from increase in interest rates | $ 12 | $ (8)
Proportion of floating interest rate exposure | 3.20% | 18.00%
Interest rate swaps | Interest Rate Risk |  |
Financial Instruments and Risk Management |  |
Number of derivative instruments outstanding | item | 0 |
Weighted average | Fixed interest rates | Interest Rate Risk |  |
Financial Instruments and Risk Management |  |
Weighted average interest rate on total debt | 6.30% | 5.80%

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