v3.26.1
Employee benefits (Details 3) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
IfrsStatementLineItems [Line Items]      
Current assets $ 17,659   $ 18,291
Non-current assets 71,620   68,234
Assets 89,279   86,525
Current liabilities 14,818   15,870
Non-current liabilities 35,515   36,305
Liabilities 50,333   52,175
Foreign countries [member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year 997 $ 860  
Interest income 51 107  
Changes on asset ceiling (39) (64)  
Translation adjustment 38 94  
Benefit obligation (Plan assets) as at ending of the year 1,047 $ 997  
Net defined benefit liability (asset) (1,158)   (1,164)
Current assets 18   30
Non-current assets 78   88
Assets 96   118
Current liabilities (69)   (68)
Non-current liabilities (1,185)   (1,214)
Liabilities (1,254)   (1,282)
Foreign countries [member] | Present Value Of Actuarial Liabilities [Member]      
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset) (5,653)   (5,638)
Foreign countries [member] | Fair Value Of Assets [Member]      
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset) 5,542   5,471
Foreign countries [member] | Effect of asset ceiling [member]      
IfrsStatementLineItems [Line Items]      
Net defined benefit liability (asset) $ (1,047)   $ (997)