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Financial Instruments And Risk Management - Liquidity Risk (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Liabilities |  |
Debt undiscounted cash flows | $ 17,455.0 |
Derivative liabilities, net | 155.0 | $ 179.0
Derivative financial assets | 1,384.0 | 1,052.0
Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 5,576.0 | 6,100.0
Derivatives |  |
Financial Liabilities |  |
Gross derivative liability undiscounted cash flows | 1,539.0 | 1,231.0
Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 30,114.0 | 28,320.0
2019 |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 3,459.0 |
2019 | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 5,492.0 | 6,024.0
2019 | Derivatives |  |
Financial Liabilities |  |
Gross derivative liability undiscounted cash flows | 1,539.0 | 1,231.0
2019 | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 4,314.0 | 3,027.0
1 to 3 years | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 42.0 | 38.0
1 to 3 years | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 3,362.0 | 1,949.0
3 to 5 years | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 42.0 | 38.0
3 to 5 years | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 1,827.0 | 3,184.0
Thereafter |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 12,108.0 |
Thereafter | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | $ 20,611.0 | $ 20,160.0

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