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Employee benefits (Details 8) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Overfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of expected rates of inflation 3.50% 3.08%
Overfunded Pension Plans [Member] | Country of domicile [member] | Actuarial assumption of discount rates [member]    
IfrsStatementLineItems [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 1,990  
Actuarial Assumption Of Discount Rate, Increase In Assumption 12.28%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 2,253  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 10.28%  
Overfunded Pension Plans [Member] | Country of domicile [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 11.07% 8.57%
Actuarial assumption of nominal average rate of expense or income 11.07% 8.57%
Actuarial assumption of expected rates of salary increases 3.50% 3.08%
Actuarial assumption of expected rates of pension increases 3.50% 3.08%
Overfunded Pension Plans [Member] | Country of domicile [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 11.48% 8.63%
Actuarial assumption of nominal average rate of expense or income 11.48% 8.63%
Actuarial assumption of expected rates of salary increases 5.57% 4.94%
Actuarial assumption of expected rates of pension increases 4.02% 3.60%
Overfunded Pension Plans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 4.66% 4.63%
Actuarial assumption of nominal average rate of expense or income 4.61% 5.10%
Actuarial assumption of expected rates of salary increases 3.10% 3.31%
Actuarial assumption of expected rates of pension increases 3.00% 3.00%
Actuarial assumption of expected rates of inflation 2.08% 2.08%
Overfunded Pension Plans [Member] | Foreign countries [member] | Actuarial assumption of discount rates [member]    
IfrsStatementLineItems [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 1,123  
Actuarial Assumption Of Discount Rate, Increase In Assumption 5.66%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 1,364  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 3.66%  
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of nominal average rate of expense or income 12.12% 10.15%
Actuarial assumption of expected rates of salary increases 4.25% 4.50%
Actuarial assumption of expected rates of pension increases 4.25% 4.50%
Actuarial assumption of medical cost trend rates 6.61% 6.17%
Actuarial assumption of ultimate medical cost trend rates 6.61% 6.17%
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member] | Actuarial assumption of discount rates [member]    
IfrsStatementLineItems [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 422  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 490  
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 11.07% 8.59%
Actuarial assumption of expected rates of inflation 3.50% 3.08%
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member] | Bottom of range [member] | Actuarial assumption of discount rates [member]    
IfrsStatementLineItems [Line Items]    
Actuarial Assumption Of Discount Rate, Increase In Assumption 12.45%  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 10.45%  
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 12.12% 10.15%
Actuarial assumption of expected rates of inflation 4.25% 4.50%
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member] | Top of range [member] | Actuarial assumption of discount rates [member]    
IfrsStatementLineItems [Line Items]    
Actuarial Assumption Of Discount Rate, Increase In Assumption 13.12%  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 11.12%  
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of nominal average rate of expense or income 4.61%  
Actuarial assumption of expected rates of salary increases 3.10% 3.31%
Actuarial assumption of expected rates of pension increases 3.00% 3.00%
Actuarial assumption of medical cost trend rates 4.50% 4.85%
Actuarial assumption of ultimate medical cost trend rates 4.39% 4.49%
Actuarial assumption of expected rates of inflation 2.08% 2.08%
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member] | Actuarial assumption of discount rates [member]    
IfrsStatementLineItems [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 1,301  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 1,684  
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 4.66% 4.63%
Actuarial assumption of nominal average rate of expense or income   5.10%
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member] | Bottom of range [member] | Actuarial assumption of discount rates [member]    
IfrsStatementLineItems [Line Items]    
Actuarial Assumption Of Discount Rate, Increase In Assumption 5.66%  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 3.66%  
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 4.72% 4.64%
Actuarial assumption of nominal average rate of expense or income   5.14%
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member] | Top of range [member] | Actuarial assumption of discount rates [member]    
IfrsStatementLineItems [Line Items]    
Actuarial Assumption Of Discount Rate, Increase In Assumption 5.72%  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 3.72%