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Financial assets and liabilities - Currency Exposures Narrative (Details) $ in Millions, $ in Millions | Jun. 30, 2024 CAD ($) | Jun. 30, 2024 USD ($) | Feb. 15, 2024 CAD ($) | Feb. 15, 2024 USD ($) | Dec. 31, 2023 CAD ($)
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Series US-9 Notes |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Notional amount |  |  | $ 942 | $ 700 |
Series US-10 Notes |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Notional amount |  |  | 1,009 | $ 750 |
Fair value hedge | Series US-10 Notes |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Notional amount |  |  | $ 336 |  |
Interest rate swap | Series US-10 Notes | Maturing in 2054 |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Notional amount | $ 336 |  |  |  |
Currency risk |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Percentage of possible change in risk variable | 10.00% | 10.00% |  |  |
Currency risk | Series US-9 Notes |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Financial liabilities, at fair value | $ 5 |  |  |  |
Currency risk | Series US-10 Notes |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Financial liabilities, at fair value | 7 |  |  |  |
Currency risk | Interest rate swap | Maturing in 2026 |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Notional amount | 324 | $ 240 |  |  |
Currency risk | Interest rate swap | Series US-9 Notes | Maturing In 2034 |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Notional amount | 942 | 700 |  |  |
Currency risk | Interest rate swap | Series US-10 Notes |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Notional amount |  |  |  |  | $ 644
Currency risk | Interest rate swap | Series US-10 Notes | Maturing in 2054 |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Notional amount | 1,009 | $ 750 |  |  |
Currency risk | Interest rate swap | Fair value hedge |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Financial assets, at fair value | 4 |  |  |  |
Currency risk | Top of range |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | 12 |  |  |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact on other comprehensive income (loss) | 130 |  |  |  |
Currency risk | Bottom of range |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |
Reasonably possible change in risk variable impact on net earnings | 44 |  |  |  |
Reasonably possible change in risk variable, impact on net earnings from continuing operations | $ 119 |  |  |  |

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