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Long-term debt - Summary of Long-Term Debt (Details) $ in Millions, $ in Millions | Dec. 31, 2025 CAD ($) | Dec. 31, 2025 USD ($) | Jun. 30, 2025 CAD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total long-term debt | $ 34,904 |  |  |  | $ 32,835 |
Forward Starting Interest Rate Swap |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  |  |  |  | 1,080 | $ 800
Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | 37,070 |  |  |  | 36,862 |
Net Unamortised Discount (Premium) |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | 8 |  |  |  | 29 |
Unamortized debt issuance costs |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | 163 |  |  |  | 132 |
Supplier finance arrangements due within one year |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | 70 |  |  |  | 73 |
Long-term debt |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | 1,925 |  |  |  | 3,793 |
1997 trust indenture | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | 17,502 |  |  |  | 20,273 |
1997 trust indenture | Trade receivables | Interest rate swap contract |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount | 1,995 |  |  |  | 1,300 |
1997 trust indenture | Trade receivables | Forward Starting Interest Rate Swap | 2028 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount | $ 525 |  |  |  | 525 |
1997 trust indenture | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 4.42% | 4.42% |  |  |  |
1976 trust indenture | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 975 |  |  |  | 975 |
1976 trust indenture | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 9.38% | 9.38% |  |  |  |
2016 U.S. trust indenture |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  | $ 5,706 |  |  |  | $ 6,550
2016 U.S. trust indenture | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 7,840 |  |  |  | 9,445 |
2016 U.S. trust indenture | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 4.37% | 4.37% |  |  |  |
1996 trust indenture (subordinated) | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 275 |  |  |  | 275 |
1996 trust indenture (subordinated) | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 8.21% | 8.21% |  |  |  |
Subordinated 2025 Canadian Trust Indenture | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 1,250 |  |  |  | 0 |
Subordinated 2025 Canadian Trust Indenture | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 5.63% | 5.63% |  |  |  |
Subordinated 2025 U.S. Trust Indenture |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | $ 2,250 |  |  |  |  |
Subordinated 2025 U.S. Trust Indenture | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 3,088 |  |  |  | 0 |
Subordinated 2025 U.S. Trust Indenture | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 6.94% | 6.94% |  |  |  |
Lease liabilities | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 4,309 |  |  |  | 4,591 |
Lease liabilities | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 4.24% | 4.24% |  |  |  |
Bell Mobility trade loan |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, principal amount, repurchased |  | $ 600 |  |  |  |
Bell Mobility trade loan | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 0 |  |  |  | 863 |
Unsecured committed term loan facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings |  | $ 487 |  |  |  |
Unsecured committed term loan facility | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 668 |  |  |  | 0 |
Unsecured committed term loan facility | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 4.40% | 4.40% |  |  |  |
Unsecured term loan facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings |  | $ 500 |  |  |  |
Unsecured term loan facility | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 686 |  |  |  | 0 |
Unsecured term loan facility | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 5.38% | 5.38% |  |  |  |
Supplier finance arrangements | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 165 |  |  |  | 197 |
Supplier finance arrangements | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average interest rate at December 31, 2025 | 4.00% | 4.00% |  |  |  |
Other | Trade receivables |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total debt | $ 312 |  |  |  | $ 243 |
Total non-committed credit facilities | Bell Mobility Inc. |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, principal amount, repurchased |  |  | $ 819 | $ 600 |  |

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