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Employee benefits (Details 11) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Pension and medical benefits $ 23,805 $ 20,447 $ 27,217
Petros pension plan renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 12,771    
Petros pension plan non renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 4,119    
Petros two pension plan [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 1,102    
Ams Medical Plan [Member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 5,813    
Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 1,728 1,520  
Not later than one year [member] | Petros pension plan renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 999    
Not later than one year [member] | Petros pension plan non renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 354    
Not later than one year [member] | Petros two pension plan [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 74    
Not later than one year [member] | Ams Medical Plan [Member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 301    
Later than one year and not later than five years [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 7,021 6,150  
Later than one year and not later than five years [member] | Petros pension plan renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 4,122    
Later than one year and not later than five years [member] | Petros pension plan non renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 1,437    
Later than one year and not later than five years [member] | Petros two pension plan [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 313    
Later than one year and not later than five years [member] | Ams Medical Plan [Member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 1,149    
Later than five years and not later than ten years [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 5,367 4,615  
Later than five years and not later than ten years [member] | Petros pension plan renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 2,888    
Later than five years and not later than ten years [member] | Petros pension plan non renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 973    
Later than five years and not later than ten years [member] | Petros two pension plan [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 231    
Later than five years and not later than ten years [member] | Ams Medical Plan [Member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 1,275    
Later than ten years and not later than fifteen years [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 3,762 3,193  
Later than ten years and not later than fifteen years [member] | Petros pension plan renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 1,962    
Later than ten years and not later than fifteen years [member] | Petros pension plan non renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 622    
Later than ten years and not later than fifteen years [member] | Petros two pension plan [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 166    
Later than ten years and not later than fifteen years [member] | Ams Medical Plan [Member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 1,012    
Later Than Fifteen Years [Member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 5,927 $ 4,969  
Later Than Fifteen Years [Member] | Petros pension plan renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 2,800    
Later Than Fifteen Years [Member] | Petros pension plan non renegotiated [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits [1] 733    
Later Than Fifteen Years [Member] | Petros two pension plan [member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits 318    
Later Than Fifteen Years [Member] | Ams Medical Plan [Member]      
IfrsStatementLineItems [Line Items]      
Pension and medical benefits $ 2,076    
[1] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.