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Financial and capital management - Market Risk Narrative (Details) $ in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 01, 2025 CAD ($) | Dec. 31, 2025 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2025 USD ($) | Sep. 23, 2025 CAD ($) | Sep. 23, 2025 USD ($) | Aug. 14, 2025 CAD ($) | Dec. 31, 2024 USD ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives |  | $ (9) | $ (269) |  |  |  |  |
Loss on change in fair value of derivatives |  | $ 9 | 269 |  |  |  |  |
Unsecured Term Loan |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 692 | $ 500 |  |
Series M-65 Medium Term Note Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 500 |
Series M-66 Medium Term Note Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | 600 |
Series M-67 Medium Term Note Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 500 |
Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Percentage of possible change in risk variable |  | 10.00% |  | 10.00% |  |  |  |
Currency risk | Top of range |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | $ (22) |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on other comprehensive income |  | (146) |  |  |  |  |  |
Currency risk | Bottom of range |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | 15 |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on other comprehensive income |  | 126 |  |  |  |  |  |
Currency risk | Series US-9 Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | 4 |  |  |  |  |  |
Financial assets, at fair value |  |  | 5 |  |  |  |  |
Currency risk | Series US-10 Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | $ 17 | 44 |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Percentage of possible change in risk variable |  | 1.00% |  | 1.00% |  |  |  |
Interest rate risk | Top of range |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on other comprehensive income |  | $ (3) |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | 32 |  |  |  |  |  |
Interest rate risk | Bottom of range |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on other comprehensive income |  | 4 |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | (26) |  |  |  |  |  |
Interest rate risk | Series A and Series B Notes Maturing in 2055 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 3 |  |  |  |  |  |
Interest rate risk | Series M-55 Medium-term notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives |  | (3) |  |  |  |  |  |
Loss on change in fair value of derivatives |  | 3 |  |  |  |  |  |
Interest rate risk | Series M-55 Medium-term notes | Maturing in 2025 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 300 |  |  |  |  |  |
Equity price risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives |  | $ (9) | (269) |  |  |  |  |
Percentage of possible change in risk variable |  | 5.00% |  | 5.00% |  |  |  |
Reasonably possible change in risk variable impact on net earnings |  | $ (16) |  |  |  |  |  |
Loss on change in fair value of derivatives |  | 9 | 269 |  |  |  |  |
Forward contract | Equity price risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | 187 | 429 |  |  |  |  |
Amortizing Cross Currency Interest Rate Swaps | Currency risk | Maturing in 2029 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 678 |  | $ 487 |  |  |  |
Hedging instrument, liabilities |  | 11 |  |  |  |  |  |
Interest rate swap contract | Series M-53 Medium Term Notes Debentures | Maturing in 2027 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 625 |  |  |  |  |
Interest rate swap contract | Series M-52 Medium Term Notes Debentures | Maturing in 2030 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 250 |  |  |  |  |
Interest rate swap contract | Series M-57 Medium Term Notes Debentures | Maturing in 2025 and 2032 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, swaps terminated |  |  | 200 |  |  |  |  |
Interest rate swap contract | Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, assets |  | 4 |  |  |  |  |  |
Interest rate swap contract | Currency risk | Fair value hedges |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | 110 |  |  |  |  |  |
Interest rate swap contract | Currency risk | Maturing in 2025 and 2026 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, financial instrument terminated |  | 814 |  | 600 |  |  |  |
Interest rate swap contract | Currency risk | Series US-2 Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, financial instrument terminated |  | 235 |  | 174 |  |  |  |
Interest rate swap contract | Currency risk | Series US-4 Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, financial instrument terminated |  | 100 |  | 79 |  |  |  |
Interest rate swap contract | Currency risk | Series US-5 Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, financial instrument terminated |  | 230 |  | 183 |  |  |  |
Interest rate swap contract | Currency risk | Series US-6 Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, financial instrument terminated |  | 241 |  | 191 |  |  |  |
Interest rate swap contract | Currency risk | Series US-7 Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, financial instrument terminated |  | 276 |  | 217 |  |  |  |
Interest rate swap contract | Currency risk | Series A Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | 69 |  |  |  |  |  |
Initial net hedging liabilities |  | 55 |  |  |  |  |  |
Interest rate swap contract | Currency risk | Series A Notes | Maturing in 2030 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 1,468 |  | 1,000 |  |  |  |
Interest rate swap contract | Currency risk | Series B Notes Maturing in 2055 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | 59 |  |  |  |  |  |
Initial net hedging liabilities |  | 55 |  |  |  |  |  |
Interest rate swap contract | Currency risk | Series B Notes Maturing in 2055 | Maturing In 2035 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 1,288 |  | 878 |  |  |  |
Interest rate swap contract | Currency risk | Series US-9 Notes | Fair value hedges |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 942 |  |  |  |  | $ 700
Interest rate swap contract | Currency risk | Series US-10 Notes | Maturing in 2054 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 1,009 |  |  |  |  | 750
Interest rate swap contract | Interest rate risk | Maturing in 2028 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 200 |  |  |  |  |  |
Hedging instrument, liabilities |  | 9 |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series A Notes | Maturing in 2030 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 531 |  | 372 |  |  |  |
Hedging instrument, assets terminated |  | 9 |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series B Notes Maturing in 2055 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, assets |  | 4 |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series B Notes Maturing in 2055 | Maturing In 2035 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 531 |  | 372 |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-45 Medium-term notes | Maturing in 2047 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 200 |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-65 Medium Term Note Debentures | Maturing in 2033 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 300 |  |  |  |  |  |
Hedging instrument, liabilities |  | 1 |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-66 Medium Term Note Debentures | Maturing in 2036 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 300 |  |  |  |  |  |
Hedging instrument, liabilities |  | 3 |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-62 Medium Term Notes Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, swaps terminated |  | 105 |  |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-53 Medium Term Notes Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, assets |  |  | 6 |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-52 Medium Term Notes Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, assets |  |  | 6 |  |  |  |  |
Interest rate swap contract | Interest rate risk | Series M-57 Medium Term Notes Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, assets terminated |  |  | 6 |  |  |  |  |
Foreign Exchange Swaps | Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 521 |  | 372 |  |  |  |
Hedging instrument, liabilities |  | 13 |  |  |  |  |  |
Initial net hedging liabilities |  | 14 |  |  |  |  |  |
Foreign Exchange Swaps | Currency risk | Maturing in 2025 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 524 |  | 372 |  |  |  |
Hedging instrument, liabilities |  | 2 |  |  |  |  |  |
Hedging instrument, assets |  | 13 |  |  |  |  |  |
Foreign Exchange Swaps | Currency risk | Series A Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | 12 |  |  |  |  |  |
Initial net hedging liabilities |  | 12 |  |  |  |  |  |
Initial net hedging assets |  | 9 |  |  |  |  |  |
Foreign Exchange Swaps | Currency risk | Series A Notes | Maturing in 2025 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 1,398 |  | 1,000 |  |  |  |
Foreign Exchange Swaps | Currency risk | Series B Notes Maturing in 2055 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Initial net hedging liabilities |  | 14 |  |  |  |  |  |
Foreign Exchange Swaps | Currency risk | Series B Notes Maturing in 2055 | Maturing in 2025 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 1,769 |  | 1,250 |  |  |  |
Foreign Exchange Swaps | Currency risk | Series B Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | 24 |  |  |  |  |  |
Notional amount, financial instrument terminated |  | 643 |  | 456 |  |  |  |
Foreign Exchange Swaps | Currency risk | Series B Notes | Maturing in 2025 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 1,167 |  | 828 |  |  |  |
Currency Basis Rate Swap Contract | Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 644 |  |  |  |  |
Interest Rate Swaptions | Maturing in 2024 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 289 |  |  |  |  | 214
Interest Rate Swaptions | Series M-53 Medium Term Notes Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 625 |  |  |  |  |
Hedging instrument, liabilities |  |  | 6 |  |  |  |  |
Interest Rate Swaptions | Series M-53 Medium Term Notes Debentures | Maturing in 2027 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 750 |  |  |  |  |
Interest Rate Swaptions | Series M-17 Medium Term Notes Debentures | Maturing In 2035 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 300 |  |  |  |  |
Interest Rate Swaptions | Interest rate risk | Maturing in 2030 and 2035 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 690 |  |  |  |  |  |
Interest Rate Floor | Interest rate risk | Series M-62 Medium Term Notes Debentures | Maturing in 2029 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount, financial instrument terminated |  | 350 |  |  |  |  |  |
Forward Starting Interest Rate Swap |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 1,080 |  |  |  |  | 800
Notional amount, swaps terminated |  |  | 338 |  |  |  |  | 250
Notional amount, swaps unterminated |  |  | 742 |  |  |  |  | 550
Forward Starting Interest Rate Swap | Maturing in 2030 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | 400
Notional amount, swaps unterminated |  |  | 275 |  |  |  |  |
Forward Starting Interest Rate Swap | Maturing In 2035 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 400
Notional amount, swaps unterminated |  |  | 275 |  |  |  |  |
Forward Starting Interest Rate Swap | Series US-10 Notes | Maturing in 2054 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 336 |  |  |  |  |
Forward Starting Interest Rate Swap | Interest rate risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, liabilities |  | 3 |  |  |  |  |  |
Hedging instrument, assets |  | 50 | 38 |  |  |  |  |
Notional amount, swaps terminated |  | 500 |  | 350 |  |  |  |
Hedging instrument, assets terminated |  |  | 7 |  |  |  |  |
Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2055 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 423 |  |  |  |  |  |
Forward Starting Interest Rate Swap | Interest rate risk | Series US-10 Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, assets |  |  | 20 |  |  |  |  |
Forward Starting Interest Rate Swap | Interest rate risk | Series M-67 Medium Term Note Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, assets |  | 25 |  |  |  |  |  |
Interest Rate Options | Series M-62 Medium Term Notes Debentures | Maturing in 2029 |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  |  | 440 |  |  |  |  |
Interest Rate Options | Interest rate risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Hedging instrument, assets terminated |  |  | $ 1 |  |  |  |  |
Ziply Fiber |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives | $ 7 |  |  |  |  |  |  |
Loss on change in fair value of derivatives | $ (7) |  |  |  |  |  |  |
Ziply Fiber | Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Cash deposits, hedging instrument |  | 4,908 |  | 3,545 |  |  |  |
Ziply Fiber | Currency risk | Unsecured Term Loan |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 697 |  | 500 |  |  |  |
Ziply Fiber | Deal Contingent Foreign Exchange Forward Contracts | Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | 1,241 |  | 905 |  |  |  |
Ziply Fiber | Forward contract | Currency risk |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |
Notional amount |  | $ 1,402 |  | $ 1,019 |  |  |  |

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Balance Type: | debit
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Balance Type: | debit
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Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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Balance Type: | credit
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Namespace Prefix: | bce_
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Balance Type: | credit
Period Type: | instant

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Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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Namespace Prefix: | bce_
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