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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, 2023
USD ($)
Discount Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ (275)
Decrease in assumption $ 300
Price inflation [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 96
Decrease in assumption $ (103)
Future Salary Increases [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 23
Decrease in assumption $ (21)
Medical Cost Trend Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 1.00%
Increase in assumption $ 25
Decrease in assumption $ (22)
Actual Assumption Of Mortality Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption One year
Increase in assumption $ 155
Decrease in assumption $ (157)