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Employee benefits (Details 4) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Net defined benefit liability $ 1,387 $ 1,452
Total Net defined benefit liability 12,620 11,246
Current net defined benefit liability 778 719
Non-current net defined benefit liability 11,842 10,527
Health Care Plan [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 6,536 5,813
Petros pension plan renegotiated [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 3,940 3,606
Petros pension plan non renegotiated [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 1,140 1,041
Petros pension plan renegotiated one [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 437 284
Petros pension plan non renegotiated one [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability 378 339
Petros two pension plan [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability $ 189 $ 163