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Financial assets and liabilities - Currency Exposures Narrative (Details) $ in Millions, $ in Millions | Jun. 30, 2026 USD ($) | Jun. 30, 2026 CAD ($)
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Currency risk |  |
Disclosure of detailed information about hedges [line items] |  |
Percentage of possible change in risk variable | 10.00% | 10.00%
Currency risk | Top of range |  |
Disclosure of detailed information about hedges [line items] |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact in net earnings |  | $ (42)
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar gain (loss) on other comprehensive income (loss) |  | 16
Currency risk | Bottom of range |  |
Disclosure of detailed information about hedges [line items] |  |
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact in net earnings |  | 3
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar gain (loss) on other comprehensive income (loss) |  | 13
Interest rate swap |  |
Disclosure of detailed information about hedges [line items] |  |
Hedging instrument, liabilities |  | 1
Interest rate swap | Currency risk |  |
Disclosure of detailed information about hedges [line items] |  |
Hedging instrument, liabilities | $ 82 |
Amortizing Cross Currency Interest Rate Swaps | Currency risk | 2029 |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | 213 | 292
Hedging instrument, assets |  | 9
Series US-1 Notes | Interest rate swap | Currency risk |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount, financial instrument terminated | 353 | 464
Series US-2 Notes | Interest rate swap | Currency risk |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount, financial instrument terminated | 98 | 132
Series US-4 Notes | Interest rate swap | Currency risk |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount, financial instrument terminated | 109 | 139
Series US-5 Notes | Interest rate swap | Currency risk |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount, financial instrument terminated | 91 | 114
Series US-6 Notes | Interest rate swap | Currency risk |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount, financial instrument terminated | 84 | 106
Series US-7 Notes | Interest rate swap | Currency risk |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount, financial instrument terminated | 143 | 182
Series US-11 Notes | Interest rate swap | Currency risk | 2036 |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | $ 650 | 899
Hedging instrument, assets |  | $ 6

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