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Employee benefits (Details 11) - Underfunded Pension Plans [Member] - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Cash and cash equivalents, amount contributed to fair value of plan assets $ 8 $ 6  
Equity securities 89 112  
International investments 66    
Real estate, amount contributed to fair value of plan assets 43 27  
Loans to participants, amount contributed to fair value of plan assets 1 1  
Other 116 131  
Total 743 817  
Loans to corporate entities [member]      
IfrsStatementLineItems [Line Items]      
Debt instruments, amount contributed to fair value of plan assets 114 215  
Governmental Bonds [Member]      
IfrsStatementLineItems [Line Items]      
Debt instruments, amount contributed to fair value of plan assets 236 210  
Fixed Income [Member]      
IfrsStatementLineItems [Line Items]      
Investment funds, amount contributed to fair value of plan assets 43 41  
Equity investments [member]      
IfrsStatementLineItems [Line Items]      
Investment funds, amount contributed to fair value of plan assets 1 19  
Private Equity Funds [Member]      
IfrsStatementLineItems [Line Items]      
Structured debt, amount contributed to fair value of plan assets 26 55  
Level 1 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Cash and cash equivalents, amount contributed to fair value of plan assets  
Equity securities 89 112  
Total 152 221  
Level 1 of fair value hierarchy [member] | Governmental Bonds [Member]      
IfrsStatementLineItems [Line Items]      
Debt instruments, amount contributed to fair value of plan assets 20 60  
Level 1 of fair value hierarchy [member] | Fixed Income [Member]      
IfrsStatementLineItems [Line Items]      
Investment funds, amount contributed to fair value of plan assets 43 41  
Level 1 of fair value hierarchy [member] | Equity investments [member]      
IfrsStatementLineItems [Line Items]      
Investment funds, amount contributed to fair value of plan assets   8  
Level 2 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Cash and cash equivalents, amount contributed to fair value of plan assets 8 6  
Total 365 382  
Level 2 of fair value hierarchy [member] | Loans to corporate entities [member]      
IfrsStatementLineItems [Line Items]      
Debt instruments, amount contributed to fair value of plan assets 114 215  
Level 2 of fair value hierarchy [member] | Governmental Bonds [Member]      
IfrsStatementLineItems [Line Items]      
Debt instruments, amount contributed to fair value of plan assets 216 150  
Level 2 of fair value hierarchy [member] | Equity investments [member]      
IfrsStatementLineItems [Line Items]      
Investment funds, amount contributed to fair value of plan assets 1 11  
Level 2 of fair value hierarchy [member] | Private Equity Funds [Member]      
IfrsStatementLineItems [Line Items]      
Structured debt, amount contributed to fair value of plan assets 26    
Level 3 of fair value hierarchy [member]      
IfrsStatementLineItems [Line Items]      
Cash and cash equivalents, amount contributed to fair value of plan assets  
Total 226 214 $ 140
Level 3 Of Fair Values Hierarchy [Member]      
IfrsStatementLineItems [Line Items]      
Real estate, amount contributed to fair value of plan assets 43 27  
Loans to participants, amount contributed to fair value of plan assets 1 1  
Other 116 131  
Total 226 214  
Level 3 Of Fair Values Hierarchy [Member] | International Investments [Member]      
IfrsStatementLineItems [Line Items]      
International investments $ 66    
Level 3 Of Fair Values Hierarchy [Member] | Private Equity Funds [Member]      
IfrsStatementLineItems [Line Items]      
Structured debt, amount contributed to fair value of plan assets   $ 55