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Employee benefits - Actuarial and economic assumptions and sensitivity analysis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 6.20% 5.48%
Top of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 9.51% 8.79%
Overfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of expected rates of pension increases   3.25%
Actuarial assumption of expected rates of inflation 3.50% 3.25%
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 $ 2,451  
Actuarial Assumption Of Discount Rate, Increase In Assumption 10.83%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 2,845  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 8.83%  
Overfunded Pension Plans [Member] | Country of domicile [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 9.77% 8.62%
Actuarial assumption of nominal average rate of expense or income 9.77% 8.62%
Actuarial assumption of expected rates of salary increases 3.50% 3.25%
Actuarial assumption of expected rates of pension increases 3.50%  
Overfunded Pension Plans [Member] | Country of domicile [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 9.88% 8.82%
Actuarial assumption of nominal average rate of expense or income 9.88% 8.82%
Actuarial assumption of expected rates of salary increases 5.36% 5.32%
Actuarial assumption of expected rates of pension increases 4.02%  
Overfunded Pension Plans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 5.10%  
Actuarial assumption of nominal average rate of expense or income 2.84%  
Actuarial assumption of expected rates of salary increases 3.23%  
Actuarial assumption of expected rates of pension increases 3.00%  
Actuarial assumption of expected rates of inflation 2.06%  
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 $ 2,244  
Actuarial Assumption Of Discount Rate, Increase In Assumption 6.11%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 2,799  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 4.11%  
Underfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 10.66% 10.25%
Actuarial assumption of nominal average rate of expense or income 10.66% 10.25%
Actuarial assumption of expected rates of salary increases 6.86% 7.50%
Actuarial assumption of expected rates of pension increases 6.86% 7.50%
Actuarial assumption of expected rates of inflation 4.25% 5.00%
Underfunded 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 $ 237  
Actuarial Assumption Of Discount Rate, Increase In Assumption 11.66%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 257  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 9.66%  
Underfunded Pension Plans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 5.10% 2.84%
Actuarial assumption of nominal average rate of expense or income 2.84% 2.62%
Actuarial assumption of expected rates of salary increases 3.23% 3.28%
Actuarial assumption of expected rates of pension increases 3.00% 3.00%
Actuarial assumption of expected rates of inflation 2.06% 2.10%
Underfunded 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 $ 322  
Actuarial Assumption Of Discount Rate, Increase In Assumption 6.11%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 403  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 4.11%  
Other Benefits [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of medical cost trend rates 6.35% 6.35%
Actuarial assumption of ultimate medical cost trend rates 6.35% 6.35%
Actuarial assumption of expected rates of inflation 3.50%  
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 $ 413  
Actuarial Assumption Of Discount Rate, Increase In Assumption 10.86%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 320  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 8.86%  
Other Benefits [Member] | Country of domicile [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 9.81% 8.68%
Other Benefits [Member] | Country of domicile [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 9.90% 8.86%
Other Benefits [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of discount rates 5.14% 3.03%
Actuarial assumption of nominal average rate of expense or income 3.03% 2.62%
Actuarial assumption of medical cost trend rates 5.11% 5.11%
Actuarial assumption of ultimate medical cost trend rates 4.57% 4.57%
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 $ 649  
Actuarial Assumption Of Discount Rate, Increase In Assumption 6.14%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 832  
Actuarial Assumption Of Discount Rate, Decrease In Assumption 4.14%