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Assets Held For Sale - Narrative (Details) - Retail $ in Millions |  | 6 Months Ended
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Nov. 30, 2021 CAD ($) gasStation | Jun. 30, 2022 CAD ($) | Jun. 30, 2021 CAD ($)
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Assets held-for-sale, number of gas stations | gasStation | 337 |  |
Consideration for sale of assets held for sale | $ 420 |  |
Operating margin associated with assets held for sale |  | $ 6 | $ 7

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