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Risk Management Activities - Netting Arrangements (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
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 | $ (191) | $ (116)
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | 140 | 53
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | (51) | (63)
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 | (100) | (42)
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | 42 | 6
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | (58) | (36)
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 | 316 | 224
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | (140) | (53)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | 176 | 171
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 | 631 | 657
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | (42) | (6)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | $ 589 | $ 651

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