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Property, plant and equipment (Details 3) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Right-of-use assets $ 19,212 $ 17,052
Right-of-use assets (19,212) (17,052)
Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (5,386) (4,472)
Right-of-use assets 5,386 4,472
Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 3,611 3,718
Right-of-use assets (3,611) (3,718)
Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 1,461 1,140
Right-of-use assets (1,461) (1,140)
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 29,670 26,382
Right-of-use assets (29,670) (26,382)
Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (10,458) (9,330)
Right-of-use assets 10,458 9,330
Platforms [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 9,211 9,840
Right-of-use assets (9,211) (9,840)
Platforms [member] | Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 3,393 3,522
Right-of-use assets (3,393) (3,522)
Platforms [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 12,604 13,362
Right-of-use assets (12,604) (13,362)
Platforms [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (3,393) (3,522)
Right-of-use assets 3,393 3,522
Vessels [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 8,254 5,997
Right-of-use assets (8,254) (5,997)
Vessels [member] | Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (5,322) (4,375)
Right-of-use assets 5,322 4,375
Vessels [member] | Brazil [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 218 196
Right-of-use assets (218) (196)
Vessels [member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 994 699
Right-of-use assets (994) (699)
Vessels [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 14,788 11,267
Right-of-use assets (14,788) (11,267)
Vessels [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (6,534) (5,270)
Right-of-use assets 6,534 5,270
Properties [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 1,747 1,215
Right-of-use assets (1,747) (1,215)
Properties [member] | Without Contractual Readjustment Clauses [Member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (64) (97)
Right-of-use assets 64 97
Properties [member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 467 441
Right-of-use assets (467) (441)
Properties [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets 2,278 1,753
Right-of-use assets (2,278) (1,753)
Properties [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Right-of-use assets (531) (538)
Right-of-use assets $ 531 $ 538