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Inventory (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 CAD ($) emissionCredit | Dec. 31, 2020 CAD ($) emissionCredit
Analysis of income and expenses [Line Items] |  |
Additions to emission credits | emissionCredit | 2,033,752 | 1,434,761
Purchased emission credits | $ 55 | $ 38
Inventory, emission credits | emissionCredit | 1,922,973 | 1,211,230
Inventory write-down | $ 65 | $ 37
Increased depreciation from the accelerated closure | 48 |
Write-downs | 28 | $ 0
OM&A |  |
Analysis of income and expenses [Line Items] |  |
Write-downs | $ 28 |

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