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Pension and similar obligations - Summary of Net Liability for Post-employment and Long-term Employee Benefit Plans (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [abstract]        
Present value of funded obligations $ (4,090) $ (4,784)    
Fair value of plan assets 3,547 3,882    
Present value of net obligations for funded plans (543) (902)    
Present value of unfunded obligations (542) (619)    
Present value of net obligations (1,085) (1,521)    
Unrecognized asset (63) (38) $ (43) $ (32)
Net liability (1,148) (1,559)    
Other long term employee benefits (106) (102)    
Net liability (1,254) (1,661)    
Employee benefits amounts in the statement of financial position:        
Liabilities (1,296) (1,673)    
Assets 42 12    
Net liability $ (1,254) $ (1,661)