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Long-term debt - Summary of Long-Term Debt (Details) $ in Millions, $ in Millions | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Total long-term debt | $ 32,835 |  | $ 31,135 |
Forward Starting Interest Rate Swap |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | $ 1,080 | $ 800 |  |
1997 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate at December 31, 2024 | 4.18% | 4.18% |  |
1976 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate at December 31, 2024 | 9.38% | 9.38% |  |
2011 trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate at December 31, 2024 |  |  |  |
2016 U.S. trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | $ 6,550 |  |  | $ 5,700
2016 U.S. trust indenture | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate at December 31, 2024 | 4.24% | 4.24% |  |
1996 trust indenture (subordinated) | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate at December 31, 2024 | 8.21% | 8.21% |  |
Lease liabilities | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate at December 31, 2024 | 4.35% | 4.35% |  |
Bell Mobility trade loan | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate at December 31, 2024 | 4.87% | 4.87% |  |
Supplier finance arrangements | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate at December 31, 2024 | 6.42% | 6.42% |  |
Trade receivables |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | $ 36,862 |  | 34,527 |
Trade receivables | 1997 trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 20,273 |  | 19,768 |
Trade receivables | 1976 trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 975 |  | 975 |
Trade receivables | 2011 trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 0 |  | 225 |
Trade receivables | 2016 U.S. trust indenture |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 9,445 |  | 7,529 |
Notional amount |  |  |  | 600
Trade receivables | 1996 trust indenture (subordinated) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 275 |  | 275 |
Trade receivables | Lease liabilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 4,591 |  | 4,857 |
Trade receivables | Bell Mobility trade loan |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 863 | $ 600 | 476 | $ 360
Trade receivables | Supplier finance arrangements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 197 |  | 218 |
Trade receivables | Other |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 243 |  | 204 |
Trade receivables | Series M-53 MTN debentures | Interest rate swap contract |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | 1,300 |  | 1,625 |
Trade receivables | Series M-53 MTN debentures | Forward Starting Interest Rate Swap | 2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | 525 |  |  |
Net unamortized discount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 29 |  | 33 |
Unamortized debt issuance costs |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 132 |  | 112 |
Supplier finance arrangements due within one year |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 73 |  | 74 |
Long-term debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | $ 3,793 |  | $ 3,173 |

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