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Pension and similar obligations - Summary of Sensitivity Analysis of Defined Benefit Obligation for Weighted Principle Assumption (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Discount Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ (232)
Decrease in assumption $ 237
Price inflation [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 88
Decrease in assumption $ (109)
Future Salary Increases [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 17
Decrease in assumption $ (20)
Medical Cost Trend Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 1.00%
Increase in assumption $ 17
Decrease in assumption $ (15)
Actual Assumption Of Mortality Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption One year
Increase in assumption $ 120
Decrease in assumption $ (138)