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Employee benefits (Details 4)
$ in Millions
Dec. 31, 2024
USD ($)
Pension Plans P P S P R [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability $ 2,684
Pension Plans P P S P R [Member] | Deficit Petros [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability 259
Pension Plans P P S P R [Member] | Ordinary And Extraordinary Future Contributions Sponsor [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability 3,744
Pension Plans P P S P R [Member] | Contributions Related T F C Sponsor [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability 658
Pension Plans P P S P R [Member] | Financial Assumptions Method [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability (1,976)
Pension Plans P P S P N R [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability 1,158
Pension Plans P P S P N R [Member] | Deficit Petros [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability 93
Pension Plans P P S P N R [Member] | Ordinary And Extraordinary Future Contributions Sponsor [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability 1,097
Pension Plans P P S P N R [Member] | Contributions Related T F C Sponsor [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability 442
Pension Plans P P S P N R [Member] | Financial Assumptions Method [Member]  
IfrsStatementLineItems [Line Items]  
Net actuarial liability $ (474)