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Schedule of changes in property plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning $ 2,792 $ 5,234  
Increases [1] 253 239  
Impairment (403)  
Transfers  
Decreases (5) (11)  
Translation effect (70)  
Reclasification to assets clasified as held for sales (2,197)  
Property, plant and equipment, ending 3,040 2,792  
Property, plant and equipment depreciation, beginning   (1,182) $ (1,727)
Decreases 3  
Impairment 85  
Depreciation for the year (199) (276)  
Translation effect 21  
Reclasification to assets clasified as held for sales 712  
Property, plant and equipment depreciation, ending (1,381) (1,182)  
Net book value 1,659 1,610  
Property, plant and equipement's depreciation from discontinued operations   77  
Land [member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 14    
Increases [1]    
Impairment    
Transfers    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 14    
Property, plant and equipment depreciation, beginning    
Decreases    
Impairment    
Depreciation for the year    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending    
Net book value 14 14  
Buildings [member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 138    
Increases [1]    
Impairment    
Transfers 2    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 140    
Property, plant and equipment depreciation, beginning   (61)  
Decreases    
Impairment    
Depreciation for the year (7)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (68)    
Net book value 72 77  
Machinery [member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 1,363    
Increases [1] 17    
Impairment    
Transfers 78    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 1,458    
Property, plant and equipment depreciation, beginning   (437)  
Decreases    
Impairment    
Depreciation for the year (99)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (536)    
Net book value 922 926  
Wells [Member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 764    
Increases [1] 11    
Impairment    
Transfers 96    
Decreases (4)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 867    
Property, plant and equipment depreciation, beginning   (460)  
Decreases    
Impairment    
Depreciation for the year (72)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (532)    
Net book value 335 304  
Mining property [member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 253    
Increases [1]    
Impairment    
Transfers    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 253    
Property, plant and equipment depreciation, beginning   (161)  
Decreases    
Impairment    
Depreciation for the year (13)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (174)    
Net book value 79 92  
Vehicles [member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 8    
Increases [1]    
Impairment    
Transfers    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 8    
Property, plant and equipment depreciation, beginning   (6)  
Decreases    
Impairment    
Depreciation for the year (1)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (7)    
Net book value 1 2  
Fixtures and fittings [member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 52    
Increases [1] 1    
Impairment    
Transfers 3    
Decreases (1)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 55    
Property, plant and equipment depreciation, beginning   (44)  
Decreases    
Impairment    
Depreciation for the year (4)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (48)    
Net book value 7 8  
Communication and network equipment [member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 3    
Increases [1]    
Impairment    
Transfers    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 3    
Property, plant and equipment depreciation, beginning (1)  
Decreases    
Depreciation for the year    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (1)    
Net book value 2 2  
Materials And Spare Parts [Member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 31    
Increases [1] 19    
Impairment    
Transfers (20)    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 30    
Property, plant and equipment depreciation, beginning   (3)  
Decreases    
Impairment    
Depreciation for the year    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (3)    
Net book value 27 28  
Petrochemical Industrial Complex [Member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 17    
Increases [1]    
Impairment    
Transfers 6    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 23    
Property, plant and equipment depreciation, beginning   (9)  
Decreases    
Impairment    
Depreciation for the year (3)    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending (12)    
Net book value 11 8  
Work In Progress [Member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 133    
Increases [1] 153    
Impairment    
Transfers (151)    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 135    
Property, plant and equipment depreciation, beginning    
Decreases    
Impairment    
Depreciation for the year    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending    
Net book value 135 133  
Advances To Suppliers [Member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 14    
Increases [1] 52    
Impairment    
Transfers (14)    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 52    
Property, plant and equipment depreciation, beginning    
Decreases    
Impairment    
Depreciation for the year    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending    
Net book value 52 14  
Other property, plant and equipment [member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment, beginning 2    
Increases [1]    
Impairment    
Transfers    
Decreases    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment, ending 2    
Property, plant and equipment depreciation, beginning    
Decreases    
Impairment    
Depreciation for the year    
Translation effect    
Reclasification to assets clasified as held for sales    
Property, plant and equipment depreciation, ending    
Net book value $ 2 $ 2  
[1] Includes US$ 10 million corresponding to capitalized financial costs for 2020. There are no capitalized financial costs in the fiscal year ended December 31, 2021.