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Employee benefits (Details 11) - Underfunded Pension Plans [Member] - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents, amount contributed to fair value of plan assets $ 6 $ 2
Equity securities 112 55
Real estate, amount contributed to fair value of plan assets 27 6
Loans to participants, amount contributed to fair value of plan assets 1 1
Other 131 125
Total 817 339
Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 215 24
Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 210 65
Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 41 40
Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 19 13
Ifrs Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets 55 8
Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents, amount contributed to fair value of plan assets 6 2
Total 382 51
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 215 24
Level 2 of fair value hierarchy [member] | Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 150 19
Level 2 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 11 6
Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Equity securities 112 55
Total 221 148
Level 1 of fair value hierarchy [member] | Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 60 46
Level 1 of fair value hierarchy [member] | Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 41 40
Level 1 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 8 7
Level 3 Of Fair Values Hierarchy [Member]    
IfrsStatementLineItems [Line Items]    
Real estate, amount contributed to fair value of plan assets 27 6
Loans to participants, amount contributed to fair value of plan assets 1 1
Other 131 125
Total 214 140
Level 3 Of Fair Values Hierarchy [Member] | Ifrs Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets $ 55 $ 8