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Risk Management Activities - Netting Arrangements (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Current financial liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | $ (121) | $ (159)
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | 0 | 43
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | (121) | (116)
Long-term financial liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | (50) | (38)
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | 0 | 0
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | (50) | (38)
Current financial assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | 210 | 281
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | 0 | (43)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | 210 | 238
Long-term financial assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | 666 | 637
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | 0 | 0
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | $ 666 | $ 637

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