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Financial assets and liabilities - Currency Exposures Narrative (Details)
$ in Millions, $ in Millions
Jun. 30, 2026
USD ($)
Jun. 30, 2026
CAD ($)
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