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Financial Instruments And Risk Management - Risk Management (Details) CAD in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2016 CAD | Dec. 31, 2017 USD ($) $ / bbl | Dec. 31, 2017 CAD $ / bbl | Dec. 31, 2015 CAD
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Forward starting swaps |  | CAD 1,610.0 |  | CAD 1,052.0 |
Weighted average interest rate on total debt |  | 5.70% | 5.50% | 5.50% |
Cash and cash equivalents |  | CAD 3,016.0 |  | CAD 2,672.0 | CAD 4,049.0
Total credit facilities |  |  |  | 8,224.0 |
Total unutilized credit facilities |  |  |  | CAD 4,721.0 |
Commodity Price Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Increase in price per barrel of crude oil | $ / bbl |  |  | 10.00 | 10.00 |
Decrease in pre tax earnings for the company's outstanding derivative financial instruments | CAD 196.0 | 112.0 |  |  |
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 | CAD 142.0 | 129.0 |  |  |
Liquidity Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Cash and cash equivalents |  |  |  | CAD 2,700.0 |
Total credit facilities |  |  |  | 8,200.0 |
Total unutilized credit facilities |  |  |  | 4,700.0 |
Unused capacity under a Canadian debt shelf prospectus |  |  |  | CAD 2,000.0 |
Unused capacity under Canadian and U.S. universal shelf prospectus | $ |  |  | $ 2,250 |  |
Variable interest rates | Interest Rate Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Increase in interest rates | 1.00% |  |  |  |
Increase in pre-tax earnings from increase in interest rates | CAD 6.0 | CAD 17.0 |  |  |
Proportion of floating interest rate exposure | 14.90% | 7.80% |  |  |
Weighted average | Fixed interest rates | Interest Rate Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Weighted average interest rate on total debt |  | 6.20% | 5.70% | 5.70% |

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