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Financial Instruments And Risk Management - Fair Value Hierarchy (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | $ 60 | $ (105)
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 | 215 | 74
Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | (155) | (179)
Level 1 |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | 20 | (53)
Level 1 | Trade receivables |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 63 | 21
Level 1 | Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | (43) | (74)
Level 2 |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | 40 | (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 | 152 | 53
Level 2 | Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | $ (112) | $ (105)

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