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Financial Instruments And Risk Management - Fair Value Hierarchy (Details) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | CAD (105) | CAD (54)
Transfers of financial liabilities from level 1 to 2 | 0 |
Transfers of financial liabilities from level 2 to 1 | 0 |
Trade receivables |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 74 | 155
Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value |  | 209
Financial liabilities, at fair value | (179) |
Level 1 |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | (53) | (54)
Level 1 | Trade receivables |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 21 | 46
Level 1 | Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | (74) | (100)
Level 2 |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | (52) |
Level 2 | Trade receivables |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 53 | 109
Level 2 | Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | CAD (105) | CAD (109)

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