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Pensions and similar obligations - Summary of Sensitivity Analysis of Defined Benefit Obligation for Weighted Principle Assumption (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Discount Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ (217)
Decrease in assumption $ 236
Price inflation [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 97
Decrease in assumption $ (96)
Future Salary Increases [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 19
Decrease in assumption $ (18)
Medical Cost Trend Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 20
Decrease in assumption $ (17)
Actual Assumption Of Mortality Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption One year
Increase in assumption $ 130
Decrease in assumption $ (132)