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Employee benefits (Details 4) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Net defined benefit liability $ 1,452 $ 1,289
Total Net defined benefit liability 11,246 9,880
Current net defined benefit liability 719 651
Non-current net defined benefit liability 10,527 9,229
Health Care Plan [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 5,813 4,485
Petros pension plan renegotiated [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 3,606 3,233
Petros pension plan non renegotiated [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 1,041 658
Petros pension plan renegotiated one [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 284 817
Petros pension plan non renegotiated one [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 339 511
Petros two pension plan [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability $ 163 165
Other plans [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability   $ 11