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Property, plant and equipment (Details 3) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Right-of-use assets $ 27,688 $ 30,380
Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (7,610) (7,271)
Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (5,443) (5,028)
Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (1,625) (2,150)
Platforms [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 17,772 19,056
Platforms [Member] | Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (4,712) (4,803)
Vessels [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 8,326 9,204
Vessels [Member] | Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (7,490) (7,103)
Vessels [Member] | Country Of Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (731) (225)
Vessels [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (996) (1,468)
Properties [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 1,590 2,120
Properties [Member] | Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (120) (168)
Properties [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (629) (682)
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 42,366 44,829
Gross carrying amount [member] | Platforms [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 22,484 23,859
Gross carrying amount [member] | Vessels [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 17,542 18,000
Gross carrying amount [member] | Properties [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 2,340 2,970
Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (14,678) (14,449)
Accumulated depreciation and amortisation [member] | Platforms [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (4,712) (4,803)
Accumulated depreciation and amortisation [member] | Vessels [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (9,216) (8,796)
Accumulated depreciation and amortisation [member] | Properties [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets $ (750) $ (850)