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Property, plant and equipment (Details 3) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Right-of-use assets $ 30,380 $ 19,212
Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (7,271) (5,386)
Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (5,028) (3,611)
Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (2,150) (1,461)
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 44,829 29,670
Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (14,449) (10,458)
Platforms [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 19,056 9,211
Platforms [Member] | Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (4,803) (3,393)
Platforms [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 23,859 12,604
Platforms [Member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (4,803) (3,393)
Vessels [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 9,204 8,254
Vessels [Member] | Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (7,103) (5,322)
Vessels [Member] | Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (225) (218)
Vessels [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (1,468) (994)
Vessels [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 18,000 14,788
Vessels [Member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (8,796) (6,534)
Properties [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 2,120 1,747
Properties [Member] | Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (168) (64)
Properties [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (682) (467)
Properties [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 2,970 2,278
Properties [Member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets $ (850) $ (531)