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Financial instruments and risk management - Gains or losses associated with ten percent strengthening of US Dollar (Detail)
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about hedging instruments [Line Items]      
Effect on net earnings $ 193,000,000 $ 47,000,000 $ 42,000,000
Australian dollar      
Disclosure of detailed information about hedging instruments [Line Items]      
Closing exchange rate 0.62 0.69 0.68
Canadian dollar      
Disclosure of detailed information about hedging instruments [Line Items]      
Closing exchange rate 0.70 0.76 0.74
Foreign exchange risk      
Disclosure of detailed information about hedging instruments [Line Items]      
Percentage of change in annual foreign exchange rate 10.00%    
Foreign exchange risk | Australian dollar      
Disclosure of detailed information about hedging instruments [Line Items]      
Closing exchange rate 62 69  
Effect on net earnings $ 391,000,000 $ 228,000,000  
Impact directly on equity $ (977,000,000) $ (1,036,000,000)  
Foreign exchange risk | Canadian dollar      
Disclosure of detailed information about hedging instruments [Line Items]      
Closing exchange rate 70 76  
Effect on net earnings $ (362,000,000) $ (361,000,000)  
Impact directly on equity $ 0 $ 0