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Commitments and contingencies (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 04, 2022
Disclosure of contingent liabilities [line items] |  |  |  |
Commitments for property, plant and equipment and intangible assets |  | $ 3,036 |  |
Purchase obligations |  | 1,890 |  |
Leases committed not yet commenced |  | 16 |  |
Total |  | 4,942 |  |
Revenue from contracts with customers |  | (23,449) | $ (22,883) |
Major purchases of assets [member] |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Contractual asset commitments |  |  |  | $ 1,400
Legal proceedings contingent liability |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Revenue from contracts with customers | $ 44 |  |  |
2022 |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Commitments for property, plant and equipment and intangible assets |  | 1,104 |  |
Purchase obligations |  | 542 |  |
Leases committed not yet commenced |  | 7 |  |
Total |  | 1,653 |  |
2023 |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Commitments for property, plant and equipment and intangible assets |  | 757 |  |
Purchase obligations |  | 380 |  |
Leases committed not yet commenced |  | 2 |  |
Total |  | 1,139 |  |
2024 |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Commitments for property, plant and equipment and intangible assets |  | 461 |  |
Purchase obligations |  | 245 |  |
Leases committed not yet commenced |  | 6 |  |
Total |  | 712 |  |
2025 |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Commitments for property, plant and equipment and intangible assets |  | 334 |  |
Purchase obligations |  | 210 |  |
Leases committed not yet commenced |  | 1 |  |
Total |  | 545 |  |
2026 |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Commitments for property, plant and equipment and intangible assets |  | 219 |  |
Purchase obligations |  | 292 |  |
Leases committed not yet commenced |  | 0 |  |
Total |  | 511 |  |
THERE- AFTER |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Commitments for property, plant and equipment and intangible assets |  | 161 |  |
Purchase obligations |  | 221 |  |
Leases committed not yet commenced |  | 0 |  |
Total |  | $ 382 |  |

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- Definition Contractual commitments + References No definition available. + Details
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