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Employee benefits (Details 10) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value   $ (280)  
Other assets used by entity included in fair value of plan assets   (948)  
Post-employment benefit expense in profit or loss, defined benefit plans $ (1,228) (2,098)  
Post-employment benefit expense in profit or loss, defined benefit plans     $ 1,001
Line of credit facility amount withdrawn      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value [1]   (33)  
Other assets used by entity included in fair value of plan assets [1]   (424)  
Post-employment benefit expense in profit or loss, defined benefit plans [1] (457) (469) (399)
Petroleo Brasileiro S-A [member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value [1]   (5)  
Other assets used by entity included in fair value of plan assets [1]   (124)  
Post-employment benefit expense in profit or loss, defined benefit plans [1] (129) (178) (139)
TAG [Member]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value   (20)  
Other assets used by entity included in fair value of plan assets   (13)  
Post-employment benefit expense in profit or loss, defined benefit plans (33) (72) (131)
Collaboration arrangements [axis]      
IfrsStatementLineItems [Line Items]      
Defined benefit obligation, at present value   (222)  
Other assets used by entity included in fair value of plan assets   (387)  
Post-employment benefit expense in profit or loss, defined benefit plans $ (609) (1,388)  
Post-employment benefit expense in profit or loss, defined benefit plans     1,672
Other plans [member]      
IfrsStatementLineItems [Line Items]      
Post-employment benefit expense in profit or loss, defined benefit plans     $ (2)
Post-employment benefit expense in profit or loss, defined benefit plans   $ 9  
[1] It includes the balance of PPSP-R pre-70 and PPSP-NR pre-70.