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Adoption of amended accounting standards (Details) - CAD ($) $ in Millions | Jun. 30, 2026 | Mar. 31, 2026 | Jan. 01, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
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Adoption Of Amended Accounting Standards [Line Items] |  |  |  |  |  |  |
Cash | $ 477 | $ 1,367 |  | $ 314 | $ 507 | $ 1,049 | $ 1,572
Trade and other receivables | 4,173 |  |  | 4,474 |  |  |
Trade payables and other liabilities | $ 4,167 |  |  | $ 4,392 |  |  |
Impact of Amendments to IFRS 9 and IFRS 7 |  |  |  |  |  |  |
Adoption Of Amended Accounting Standards [Line Items] |  |  |  |  |  |  |
Cash |  |  | $ 107 |  |  |  |
Trade and other receivables |  |  | 2 |  |  |  |
Trade payables and other liabilities |  |  | 109 |  |  |  |
Upon adoption of Amendments to IFRS 9 and IFRS 7 |  |  |  |  |  |  |
Adoption Of Amended Accounting Standards [Line Items] |  |  |  |  |  |  |
Cash |  |  | 421 |  |  |  |
Trade and other receivables |  |  | 4,476 |  |  |  |
Trade payables and other liabilities |  |  | $ 4,501 |  |  |  |

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