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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, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about hedging instruments [Line Items]      
Effect on net earnings $ 47,000,000 $ 42,000,000 $ (14,000,000)
Australian dollar      
Disclosure of detailed information about hedging instruments [Line Items]      
Closing exchange rate 0.69 0.68 0.73
Canadian dollar      
Disclosure of detailed information about hedging instruments [Line Items]      
Closing exchange rate 0.76 0.74 0.78
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 69 68  
Effect on net earnings $ 228,000,000 $ (319,000,000)  
Impact directly on equity $ (1,036,000,000) $ (986,000,000)  
Foreign exchange risk | Canadian dollar      
Disclosure of detailed information about hedging instruments [Line Items]      
Closing exchange rate 76 74  
Effect on net earnings $ (361,000,000) $ (219,000,000)  
Impact directly on equity $ 0 $ 0