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Disclosure of operating segment information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Revenue $ 1,508 $ 1,073 $ 1,340
Intersegment revenue
Cost of sales (955) (663) (811)
Gross profit  553 410 529
Selling expenses (33) (26) (28)
Administrative expenses (99) (93) (105)
Exploration expenses (9)
Other operating income 105 51 77
Other operating expenses (58) (36) (43)
Impairment of intangible assets and inventories (4)    
Impairment of financial assets (2) (9) 2
Share of profit from associates and joint ventures 117 85 101
Operating income 579 243 462
Finance income 10 9 23
Finance costs (185) (177) (187)
Other financial results (14) 84 175
Financial results, net (189) (84) 11
Profit before income tax 390 159 473
Income tax  (77) (35) 130
Profit for the year from continuing operations 313 124 603
Profit for the year from discontinued operations (75) (592) 197
Profit for the year 238 (468) 800
Depreciation and amortization 205 286 263
Total profit attributable to:      
Owners of the company 273 (367) 692
Non - controlling interest (35) (101) 108
Assets 3,861 4,890 5,684
Liabilities 2,070 3,121 3,275
Net book values of property, plant and equipment 1,659 1,610 3,507
Increases in property, plant and equipment, intangible assets and right-of-use assets 264 242 611
Impairment of property, plant and equipment, intangible assets and inventories   (139)  
Impairment of property, plant and equipment     (62)
Generation [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 656 559 819
Intersegment revenue
Cost of sales (355) (254) (470)
Gross profit  301 305 349
Selling expenses (2) (2) (3)
Administrative expenses (31) (30) (32)
Exploration expenses
Other operating income 42 35 58
Other operating expenses (5) (6) (11)
Impairment of intangible assets and inventories (2)    
Impairment of financial assets
Share of profit from associates and joint ventures 47 67 13
Operating income 350 241 322
Finance income 4 3 2
Finance costs (46) (73) (82)
Other financial results (14) 1 86
Financial results, net (56) (69) 6
Profit before income tax 294 172 328
Income tax  (75) (33) (80)
Profit for the year from continuing operations 219 139 248
Profit for the year from discontinued operations
Profit for the year 219 139 248
Depreciation and amortization 88 95 71
Total profit attributable to:      
Owners of the company 218 147 239
Non - controlling interest 1 (8) 9
Assets 1,670 1,595 1,472
Liabilities 525 707 1,226
Net book values of property, plant and equipment 969 1,015 1,152
Increases in property, plant and equipment, intangible assets and right-of-use assets 39 61 240
Impairment of property, plant and equipment, intangible assets and inventories   (128)  
Impairment of property, plant and equipment     (52)
Distribution Of Energy [Member]      
IfrsStatementLineItems [Line Items]      
Revenue
Intersegment revenue
Cost of sales
Gross profit 
Selling expenses
Administrative expenses
Exploration expenses
Other operating income
Other operating expenses
Impairment of intangible assets and inventories    
Impairment of financial assets
Share of profit from associates and joint ventures
Operating income
Finance income
Finance costs
Other financial results
Financial results, net
Profit before income tax
Income tax 
Profit for the year from continuing operations
Profit for the year from discontinued operations (75) (592) 197
Profit for the year (75) (592) 197
Depreciation and amortization 81 79
Total profit attributable to:      
Owners of the company (39) (499) 98
Non - controlling interest (36) (93) 99
Assets 1,356 1,480
Liabilities 1,021 1,792
Net book values of property, plant and equipment 1,691
Increases in property, plant and equipment, intangible assets and right-of-use assets 135 173
Impairment of property, plant and equipment, intangible assets and inventories    
Impairment of property, plant and equipment    
Oil And Gas Segment [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 340 227 178
Intersegment revenue 113 67 270
Cost of sales (289) (243) (313)
Gross profit  164 51 135
Selling expenses (18) (15) (14)
Administrative expenses (46) (42) (47)
Exploration expenses (9)
Other operating income 58 9 4
Other operating expenses (28) (17) (11)
Impairment of intangible assets and inventories    
Impairment of financial assets (13) 3
Share of profit from associates and joint ventures 21
Operating income 130 (27) 72
Finance income 3 7 17
Finance costs (103) (100) (94)
Other financial results (16) 44 89
Financial results, net (116) (49) 12
Profit before income tax 14 (76) 84
Income tax  8 23 (16)
Profit for the year from continuing operations 22 (53) 68
Profit for the year from discontinued operations
Profit for the year 22 (53) 68
Depreciation and amortization 114 108 112
Total profit attributable to:      
Owners of the company 22 (53) 68
Non - controlling interest
Assets 1,157 1,085 1,261
Liabilities 1,324 1,174 465
Net book values of property, plant and equipment 636 543 612
Increases in property, plant and equipment, intangible assets and right-of-use assets 213 41 191
Impairment of property, plant and equipment, intangible assets and inventories    
Impairment of property, plant and equipment     (10)
Petrochemicals [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 490 267 323
Intersegment revenue
Cost of sales (424) (233) (298)
Gross profit  66 34 25
Selling expenses (13) (9) (9)
Administrative expenses (4) (3) (4)
Exploration expenses
Other operating income 1 3
Other operating expenses (3) (6) (9)
Impairment of intangible assets and inventories (2)    
Impairment of financial assets 1
Share of profit from associates and joint ventures
Operating income 45 6 6
Finance income
Finance costs (3) (3) (8)
Other financial results (2) 5 18
Financial results, net (5) 2 10
Profit before income tax 40 8 16
Income tax  (12) (2) (5)
Profit for the year from continuing operations 28 6 11
Profit for the year from discontinued operations
Profit for the year 28 6 11
Depreciation and amortization 3 2 1
Total profit attributable to:      
Owners of the company 28 6 11
Non - controlling interest
Assets 176 107 136
Liabilities 166 126 122
Net book values of property, plant and equipment 22 19 18
Increases in property, plant and equipment, intangible assets and right-of-use assets 6 3 4
Impairment of property, plant and equipment, intangible assets and inventories   (11)  
Impairment of property, plant and equipment    
Holding And Others [Member]      
IfrsStatementLineItems [Line Items]      
Revenue 22 20 20
Intersegment revenue
Cost of sales
Gross profit  22 20 20
Selling expenses (2)
Administrative expenses (18) (18) (22)
Exploration expenses
Other operating income 4 7 12
Other operating expenses (22) (7) (12)
Impairment of intangible assets and inventories    
Impairment of financial assets (2) 3 (1)
Share of profit from associates and joint ventures 70 18 67
Operating income 54 23 62
Finance income 4 1 5
Finance costs (34) (3) (4)
Other financial results 18 34 (18)
Financial results, net (12) 32 (17)
Profit before income tax 42 55 45
Income tax  2 (23) 231
Profit for the year from continuing operations 44 32 276
Profit for the year from discontinued operations
Profit for the year 44 32 276
Depreciation and amortization
Total profit attributable to:      
Owners of the company 44 32 276
Non - controlling interest
Assets 1,067 832 1,527
Liabilities 264 178 (160)
Net book values of property, plant and equipment 32 33 34
Increases in property, plant and equipment, intangible assets and right-of-use assets 6 2 3
Impairment of property, plant and equipment, intangible assets and inventories    
Impairment of property, plant and equipment    
Eliminations [Member]      
IfrsStatementLineItems [Line Items]      
Revenue
Intersegment revenue (113) (67) (270)
Cost of sales 113 67 270
Gross profit 
Selling expenses
Administrative expenses
Exploration expenses
Other operating income
Other operating expenses
Impairment of intangible assets and inventories    
Impairment of financial assets
Share of profit from associates and joint ventures
Operating income
Finance income (1) (2) (1)
Finance costs 1 2 1
Other financial results
Financial results, net
Profit before income tax
Income tax 
Profit for the year from continuing operations
Profit for the year from discontinued operations
Profit for the year
Depreciation and amortization
Total profit attributable to:      
Owners of the company
Non - controlling interest
Assets (209) (85) (192)
Liabilities (209) (85) (170)
Net book values of property, plant and equipment
Increases in property, plant and equipment, intangible assets and right-of-use assets
Impairment of property, plant and equipment, intangible assets and inventories    
Impairment of property, plant and equipment