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Financial assets and liabilities - Interest Rate Exposures (Details) $ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 CAD ($) | Jun. 30, 2023 CAD ($) | Jun. 30, 2024 CAD ($) | Jun. 30, 2023 CAD ($) | Feb. 15, 2024 CAD ($) | Feb. 15, 2024 USD ($)
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Net gains (losses) on change in fair value of derivatives | $ (23) | $ 1 | $ (113) | $ 19 |  |
Series US-10 Notes |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 1,009 | $ 750
Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Percentage of possible change in risk variable | 1.00% |  | 1.00% |  |  |
Interest rate risk | Top of range |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | $ 8 |  | $ 8 |  |  |
Interest rate risk | Bottom of range |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | 28 |  | 28 |  |  |
Interest rate swap | Series US-10 Notes | Maturing in 2054 |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount | 336 |  | 336 |  |  |
Interest rate swap | Interest rate risk | Series US-10 Notes |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 2 |  | 2 |  |  |
Interest rate swaptions | Series M-17 Medium Term Notes Debentures | Maturing In 2035 |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount | 300 |  | 300 |  |  |
Interest rate swaptions | Series M-53 Medium Term Notes Debentures |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Proceeds from sale of financial assets |  |  | 3 |  |  |
Interest rate swaptions | Series M-53 Medium Term Notes Debentures | Maturity In 2027 |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount | 750 |  | 750 |  |  |
Interest rate swaptions | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Financial liabilities, at fair value | 3 |  | 3 |  |  |
Interest rate swaptions | Interest rate risk | Series M-53 Medium Term Notes Debentures |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Financial instruments designated as hedging instruments, at fair value | 3 |  | 3 |  |  |
Interest rate floors | Maturing In 2029 |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount | 350 |  | 350 |  |  |
Interest rate options | Series M-62 Medium Term Notes Debentures | Maturing In 2029 |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount | 440 |  | 440 |  |  |
Interest rate floors and options | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Financial assets, at fair value | $ 5 |  | $ 5 |  |  |

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