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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Risk Management (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 USD ($) $ / bbl | Dec. 31, 2020 CAD ($) $ / bbl | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2018 CAD ($)
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |  |  |
Forward starting swaps |  | $ 1,643 |  | $ 2,737 |  |  |
Weighted average interest rate on total debt |  | 5.30% | 4.80% | 4.80% |  |  |
Cash and cash equivalents |  | $ 1,960 |  | $ 1,885 |  |  | $ 2,221
Total credit facilities |  |  |  | 11,074 |  |  |
Total unutilized credit facilities |  |  |  | $ 6,350 |  |  |
Secured long-term debt |  |  |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |  |  |
Additional credit facilities |  |  |  |  | $ 300.0 | $ 2.5 |
Commodity Price Risk |  |  |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |  |  |
Increase in price per barrel of crude oil | $ / bbl |  |  | 10 | 10 |  |  |
Increase (decrease) in pre-tax earnings for the company's outstanding derivative financial instruments | $ 95 | (46) |  |  |  |  |
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 | $ 182 | 146 |  |  |  |  |
Liquidity Risk |  |  |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 1,900 |  |  |
Total credit facilities |  |  |  | 11,100 |  |  |
Total unutilized credit facilities |  |  |  | $ 6,400 |  |  |
Unused capacity under a Canadian debt shelf prospectus |  |  | $ 5,000.0 |  |  |  |
Unused capacity under Canadian and U.S. universal shelf prospectus |  |  | $ 5,000.0 |  |  |  |
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 | $ (17) | $ (2) |  |  |  |  |
Proportion of floating interest rate exposure | 16.40% | 12.00% |  |  |  |  |
Weighted average | Fixed interest rates | Interest Rate Risk |  |  |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |  |  |
Weighted average interest rate on total debt |  | 5.60% | 5.30% | 5.30% |  |  |

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