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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Risk Management (Details) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2019 USD ($) $ / bbl | Dec. 31, 2019 CAD ($) $ / bbl
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Forward starting swaps |  | $ 1,384 |  |  | $ 1,643
Weighted average interest rate on total debt |  | 5.40% |  | 5.30% | 5.30%
Cash and cash equivalents |  | $ 2,221 | $ 2,672 |  | $ 1,960
Total credit facilities |  |  |  |  | 8,328
Total unutilized credit facilities |  |  |  |  | $ 889
Commodity Price Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Increase in price per barrel of crude oil | $ / bbl |  |  |  | 10 | 10
Decrease in pre tax earnings for the company's outstanding derivative financial instruments | $ 46 | 39 |  |  |
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 | $ 146 |  | $ 167 |  |
Liquidity Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 2,000
Total credit facilities |  |  |  |  | 8,300
Total unutilized credit facilities |  |  |  |  | $ 4,900
Unused capacity under a Canadian debt shelf prospectus |  |  |  | $ 2,250 |
Unused capacity under Canadian and U.S. universal shelf prospectus |  |  |  | $ 3,000 |
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 | $ (2) | $ (10) |  |  |
Proportion of floating interest rate exposure | 12.00% |  | 18.60% |  |
Weighted average | Fixed interest rates | Interest Rate Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Weighted average interest rate on total debt |  | 5.40% |  | 5.60% | 5.60%

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