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Employee benefits (Details 10) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value $ 10,252  
Fair value of plan assets $ 14,384 $ 12,559
Percentage, fair value 100.00% 100.00%
Quoted prices in active markets, fair value $ 4,132  
Quoted prices in active markets 4,132  
Unquoted prices 9,946  
Total fair value $ 14,078 $ 12,274
Percentage 98.00% 98.00%
Receivables [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value $ 1,466  
Fair value of plan assets $ 1,466 $ 1,353
Percentage, fair value 10.00% 11.00%
Fixed income [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value $ 7,698  
Fair value of plan assets $ 10,910 $ 8,845
Percentage, fair value 75.00% 70.00%
Quoted prices in active markets, fair value $ 3,212  
Government bonds [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value 7,694  
Fair value of plan assets 9,450 $ 7,450
Quoted prices in active markets, fair value 1,756  
Fixed income fund [member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets 786 864
Quoted prices in active markets, fair value 786  
Other investment [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value 4  
Fair value of plan assets 674 531
Quoted prices in active markets, fair value 670  
Variable income [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value 210  
Fair value of plan assets $ 945 $ 1,427
Percentage, fair value 5.00% 9.00%
Quoted prices in active markets, fair value $ 735  
Common and preferred shares [member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets 735 $ 1,184
Quoted prices in active markets, fair value 735  
Other investment one [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value 210  
Fair value of plan assets 210 243
Structured investments [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value 31  
Fair value of plan assets $ 216 $ 159
Percentage, fair value 4.00% 4.00%
Quoted prices in active markets, fair value $ 185  
Real estate properties [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value 541  
Fair value of plan assets $ 541 $ 490
Percentage, fair value 4.00% 4.00%
Loans to participants [member]    
IfrsStatementLineItems [Line Items]    
Unquoted prices, fair value $ 306  
Fair value of plan assets $ 306 $ 285
Percentage, fair value 2.00% 2.00%