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Financial and capital management - Market Risk Narrative (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Nov. 14, 2023 CAD ($) | Aug. 11, 2023 CAD ($) | May 11, 2023 CAD ($) | May 11, 2023 USD ($) | Feb. 09, 2023 CAD ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Early debt redemption costs | $ 0 | $ 1 |  |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives | $ 269 | 103 |  |  |  |  |  |  |
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 | $ (1) |  |  |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity | 119 |  |  |  |  |  |  |  |
Currency risk | Bottom of range |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | 73 |  |  |  |  |  |  |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on equity | $ (107) |  |  |  |  |  |  |  |
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 | Bottom of range |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | $ 28 |  |  |  |  |  |  |  |
Equity price risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Percentage of possible change in risk variable | 5.00% |  | 5.00% |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | $ (18) |  |  |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives | 269 | 103 |  |  |  |  |  |  |
Interest rate swap contract | Maturing in 2025 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 50 |  |  |  |  |  |  |  |
Interest rate swap contract | Currency risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 644 |  |  |  |  |  |  |
Financial assets, at fair value | 21 |  |  |  |  |  |  |  |
Interest rate swap contract | Currency risk | Maturing in 2026 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 324 |  | $ 240 |  |  |  |  |  |
Interest rate swap contract | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Hedging instrument, assets | 6 |  |  |  |  |  |  |  |
Interest rate swap contract | Fair value hedges | Currency risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 491 |  | $ 360 |  |  |  |  |
Financial assets, at fair value | 28 | 28 |  |  |  |  |  |  |
Fair value | 15 | 15 |  |  |  |  |  |  |
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 | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Hedging instrument, assets | 38 |  |  |  |  |  |  |  |
Hedging instrument, assets terminated | 7 |  |  |  |  |  |  |  |
Interest Rate Swaptions | Maturing in 2024 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 289 |  | 214 |  |  |  |  |  |
Interest Rate Floor | Maturing in 2029 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 350 |  |  |  |  |  |  |  |
Interest Rate Floor | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Hedging instrument, liabilities | 2 |  |  |  |  |  |  |  |
Interest Rate Options | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Hedging instrument, assets | 1 |  |  |  |  |  |  |  |
Amortizing Interest Rate Swap | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Fair value | 4 | 2 |  |  |  |  |  |  |
Amortizing Interest Rate Swap | Interest rate risk | Maturing in 2028 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 123 | 197 |  |  |  |  |  |  |
Forward contract | Equity price risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Hedging instrument, liabilities | 429 | 162 |  |  |  |  |  |  |
Series US-9 Notes | Currency risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Financial assets, at fair value | 5 |  |  |  |  |  |  |  |
Series US-9 Notes | Interest rate swap contract | Fair value hedges | Currency risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 942 |  | 700 |  |  |  |  |  |
Series US-10 Notes | Currency risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Fair value | 44 |  |  |  |  |  |  |  |
Series US-10 Notes | Interest rate swap contract | Currency risk | Maturing in 2054 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 1,009 |  | $ 750 |  |  |  |  |  |
Series US-10 Notes | Forward Starting Interest Rate Swap | Maturing in 2054 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 336 |  |  |  |  |  |  |  |
Series US-10 Notes | Forward Starting Interest Rate Swap | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Hedging instrument, assets | 20 |  |  |  |  |  |  |  |
Series US-8 Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 1,138 | $ 850 |
Series US-8 Notes | Currency risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Fair value | 37 | 37 |  |  |  |  |  |  |
Series US-8 Notes | Interest rate swap contract | Currency risk | Maturing in 2033 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 1,138 |  | $ 850 |  |  |  |  |
Series US-8 Notes | Interest rate swap contract | Fair value hedges | Currency risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Financial assets, at fair value | 11 | 11 |  |  |  |  |  |  |
Series M-53 Medium Term Notes Debentures | Interest rate swap contract | Maturing in 2027 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 625 |  |  |  |  |  |  |  |
Series M-53 Medium Term Notes Debentures | Interest Rate Swaptions |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 625 | 250 |  |  |  |  |  |  |
Hedging instrument, liabilities | 6 |  |  |  |  |  |  |  |
Series M-53 Medium Term Notes Debentures | Interest Rate Swaptions | Maturing in 2027 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 750 |  |  |  |  |  |  |  |
Series M-53 Medium Term Notes Debentures | Interest Rate Swaptions | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 425 |  |  |  |  |  |  |
Series M-52 Medium Term Notes Debentures | Interest rate swap contract | Maturing in 2030 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 250 |  |  |  |  |  |  |  |
Series M-52 Medium Term Notes Debentures | Interest rate swap contract | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 125 |  |  |  |  |  |  |
Financial assets, at fair value | 11 | 12 |  |  |  |  |  |  |
Hedging instrument, assets | 6 |  |  |  |  |  |  |  |
Series M-52 Medium Term Notes Debentures | Interest rate swap contract | Interest rate risk | Maturing in 2030 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 375 |  |  |  |  |  |  |
Series M-52 Medium Term Notes Debentures | Interest Rate Swaptions | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 375 |  |  |  |  |  |  |
Early debt redemption costs |  | 1 |  |  |  |  |  |  |
Series M-57 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 300 |  |  |  |
Series M-57 Medium Term Notes Debentures | Interest rate swap contract |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 375 |  |  |  |  |  |  |  |
Series M-57 Medium Term Notes Debentures | Interest rate swap contract | Maturing in 2032 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 150 |  |  |  |  |  |  |  |
Series M-57 Medium Term Notes Debentures | Interest rate swap contract | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 125 |  |  |  |  |  |  |
Financial assets, at fair value | 19 | 24 |  |  |  |  |  |  |
Series M-57 Medium Term Notes Debentures | Interest rate swap contract | Interest rate risk | Maturing in 2032 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 125 |  |  |  |  |  |  |
Series M-57 Medium Term Notes Debentures | Interest Rate Swaptions | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Early debt redemption costs |  | (2) |  |  |  |  |  |  |
Series M-17 Medium Term Notes Debentures | Interest Rate Swaptions | Maturing In 2035 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 300 |  |  |  |  |  |  |  |
Series M-62 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 700 |  |  |  |
Series M-62 Medium Term Notes Debentures | Forward Starting Interest Rate Swap | Maturing in 2029 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 700 |  |  |  |  |  |  |
Series M-62 Medium Term Notes Debentures | Forward Starting Interest Rate Swap | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Financial assets, at fair value | 27 | 22 |  |  |  |  |  |  |
Series M-62 Medium Term Notes Debentures | Interest Rate Options | Maturing in 2029 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount | 440 |  |  |  |  |  |  |  |
Series M-59 Medium Term Notes Debentures |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 450
Series M-59 Medium Term Notes Debentures | Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2053 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | 125 |  |  |  |  |  |  |
Series M-61 Medium Term Note Debentures |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 400 |  |  |
Series M-61 Medium Term Note Debentures | Forward Starting Interest Rate Swap | Interest rate risk |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Financial assets, at fair value | $ 35 | 48 |  |  |  |  |  |  |
Series M-61 Medium Term Note Debentures | Forward Starting Interest Rate Swap | Interest rate risk | Maturing In 2053 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |
Notional amount |  | $ 400 |  |  |  |  |  |  |

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