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Financial Instruments And Risk Management - Liquidity Risk (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Liabilities |  |
Debt undiscounted cash flows | CAD 15,646.0 |
Derivative liabilities, net | 179.0 | CAD 209.0
Derivative financial assets | 1,052.0 | 1,610.0
Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 6,100.0 | 5,464.0
Derivatives |  |
Financial Liabilities |  |
Gross derivative liability undiscounted cash flows | 1,231.0 | 1,819.0
Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 28,320.0 | 30,528.0
2018 |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 2,207.0 |
2018 | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 6,024.0 | 5,379.0
2018 | Derivatives |  |
Financial Liabilities |  |
Gross derivative liability undiscounted cash flows | 1,231.0 | 1,819.0
2018 | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 3,027.0 | 2,325.0
1 to 3 years | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 38.0 | 28.0
1 to 3 years | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 1,949.0 | 5,238.0
3 to 5 years | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 38.0 | 14.0
3 to 5 years | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 3,184.0 | 3,031.0
Thereafter |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 11,371.0 |
Thereafter | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows |  | 43.0
Thereafter | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | CAD 20,160.0 | CAD 19,934.0

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