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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Market Risk (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 CAD ($) item $ / bbl | Dec. 31, 2020 CAD ($)
Risk Management Strategy Related to Hedge Accounting |  |
Weighted average interest rate on total debt | 5.00% | 4.80%
Commodity Price Risk |  |
Risk Management Strategy Related to Hedge Accounting |  |
Increase in price per barrel of crude oil | $ / bbl | 10 |
Increase (decrease) in pre-tax earnings for the company's outstanding derivative financial instruments | $ 58 | $ (95)
Foreign Currency Exchange Risk |  |
Risk Management Strategy Related to Hedge Accounting |  |
Strengthening in the Cdn$ relative to the US$ | 1.00% |
Gains (losses) on change in value of foreign currency basis spreads, net of tax | $ 133 | 182
Variable interest rates | Interest Rate Risk |  |
Risk Management Strategy Related to Hedge Accounting |  |
Increase in interest rates | 1.00% |
Increase (decrease) in pre-tax earnings from increase in interest rates | $ (9) | $ (17)
Proportion of floating interest rate exposure | 7.00% | 16.40%
Interest rate swaps | Interest Rate Risk |  |
Risk Management Strategy Related to Hedge Accounting |  |
Number of derivative instruments outstanding | item | 0 |
Weighted average | Fixed interest rates | Interest Rate Risk |  |
Risk Management Strategy Related to Hedge Accounting |  |
Weighted average interest rate on total debt | 5.00% | 5.30%

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