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Risk Management Activities - Netting Arrangements (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Current |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | $ (306) | $ (132)
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | 138 | 69
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | (168) | (63)
Long-term |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | (122) | (104)
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | 54 | 10
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | (68) | (94)
Current |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | 394 | 120
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | (137) | (69)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | 257 | 51
Long-term |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | 330 | 69
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | (53) | (10)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | $ 277 | $ 59

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