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SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Gross profit $ 681 $ 553 $ 410
Other operating income 131 105 51
Other operating expenses (46) (58) (36)
Share of profit from associates and joint ventures 105 117 85
Operating income (loss) 631 579 243
Financial income 5 10 9
Other financial results 166 (14) 84
Financial results, net (50) (189) (84)
Profit (loss) before income tax 581 390 159
Profit (loss) of the year 457 238 (468)
Total profit (loss) of the year attributable to:      
Owners of the company 456 273 (367)
Non-controlling interest 1 (35) (101)
Profit (loss) of the year from continuing operations 457 313 124
Loss of the year from discontinued operations (75) (592)
Generation [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 663 656 559
Revenue - foreign market
Intersegment revenue
Cost of sales (370) (355) (254)
Gross profit 293 301 305
Selling expenses (3) (2) (2)
Administrative expenses (39) (31) (30)
Other operating income 25 42 35
Other operating expenses (5) (5) (6)
Impairment of property, plant and equipment, intangible assets and inventories    
Impairment of financial assets
Share of profit from associates and joint ventures 65 47 67
Operating income (loss) 336 350 241
Financial income 1 4 3
Financial costs (82) (46) (73)
Other financial results 72 (14) 1
Financial results, net (9) (56) (69)
Profit (loss) before income tax 327 294 172
Income tax (73) (75) (33)
Profit (loss) of the year 254 219 139
Depreciation and amortization 82 88 95
Total profit (loss) of the year attributable to:      
Owners of the company 253 218 147
Non-controlling interest 1 1 (8)
Assets 2,464 1,670 1,595
Liabilities 979 525 707
Net book values of property, plant and equipment 1,299 969 1,015
Increases in property, plant and equipment and right-of-use assets 115 39 61
Impairment of property, plant and equipment, intangible assets and inventories   (2) (128)
Profit (loss) of the year from continuing operations   219 139
Loss of the year from discontinued operations  
Oil And Gas Segment [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 370 282 199
Revenue - foreign market 159 58 28
Intersegment revenue 117 113 67
Cost of sales (359) (289) (243)
Gross profit 287 164 51
Selling expenses (36) (18) (15)
Administrative expenses (60) (46) (42)
Other operating income 61 58 9
Other operating expenses (26) (28) (17)
Impairment of property, plant and equipment, intangible assets and inventories (30)    
Impairment of financial assets (2) (13)
Share of profit from associates and joint ventures
Operating income (loss) 194 130 (27)
Financial income 2 3 7
Financial costs (107) (103) (100)
Other financial results (28) (16) 44
Financial results, net (133) (116) (49)
Profit (loss) before income tax 61 14 (76)
Income tax (16) 8 23
Profit (loss) of the year 45 22 (53)
Depreciation and amortization 125 114 108
Total profit (loss) of the year attributable to:      
Owners of the company 45 22 (53)
Non-controlling interest
Assets 1,234 1,157 1,085
Liabilities 1,248 1,324 1,174
Net book values of property, plant and equipment 807 636 543
Increases in property, plant and equipment and right-of-use assets 324 213 41
Impairment of property, plant and equipment, intangible assets and inventories  
Profit (loss) of the year from continuing operations   22 (53)
Loss of the year from discontinued operations  
Petrochemicals [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 425 310 178
Revenue - foreign market 192 180 89
Intersegment revenue
Cost of sales (536) (424) (233)
Gross profit 81 66 34
Selling expenses (17) (13) (9)
Administrative expenses (5) (4) (3)
Other operating income 1 1
Other operating expenses (6) (3) (6)
Impairment of property, plant and equipment, intangible assets and inventories (2)    
Impairment of financial assets 1
Share of profit from associates and joint ventures
Operating income (loss) 52 45 6
Financial income
Financial costs (3) (3) (3)
Other financial results 6 (2) 5
Financial results, net 3 (5) 2
Profit (loss) before income tax 55 40 8
Income tax (15) (12) (2)
Profit (loss) of the year 40 28 6
Depreciation and amortization 5 3 2
Total profit (loss) of the year attributable to:      
Owners of the company 40 28 6
Non-controlling interest
Assets 177 176 107
Liabilities 147 166 126
Net book values of property, plant and equipment 24 22 19
Increases in property, plant and equipment and right-of-use assets 7 6 3
Impairment of property, plant and equipment, intangible assets and inventories   (2) (11)
Profit (loss) of the year from continuing operations   28 6
Loss of the year from discontinued operations  
Holding And Others [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 20 22 20
Revenue - foreign market
Intersegment revenue
Cost of sales
Gross profit 20 22 20
Selling expenses
Administrative expenses (34) (18) (18)
Other operating income 44 4 7
Other operating expenses (9) (22) (7)
Impairment of property, plant and equipment, intangible assets and inventories (6)    
Impairment of financial assets (6) (2) 3
Share of profit from associates and joint ventures 40 70 18
Operating income (loss) 49 54 23
Financial income 9 4 1
Financial costs (36) (34) (3)
Other financial results 116 18 34
Financial results, net 89 (12) 32
Profit (loss) before income tax 138 42 55
Income tax (20) 2 (23)
Profit (loss) of the year 118 44 32
Depreciation and amortization
Total profit (loss) of the year attributable to:      
Owners of the company 118 44 32
Non-controlling interest
Assets 1,029 1,067 832
Liabilities 245 264 178
Net book values of property, plant and equipment 34 32 33
Increases in property, plant and equipment and right-of-use assets 36 6 2
Impairment of property, plant and equipment, intangible assets and inventories  
Profit (loss) of the year from continuing operations   44 32
Loss of the year from discontinued operations  
Eliminations [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market
Revenue - foreign market
Intersegment revenue (117) (113) (67)
Cost of sales 117 113 67
Gross profit
Selling expenses
Administrative expenses
Other operating income
Other operating expenses
Impairment of property, plant and equipment, intangible assets and inventories    
Impairment of financial assets
Share of profit from associates and joint ventures
Operating income (loss)
Financial income (7) (1) (2)
Financial costs 7 1 2
Other financial results
Financial results, net
Profit (loss) before income tax
Income tax
Profit (loss) of the year
Depreciation and amortization
Total profit (loss) of the year attributable to:      
Owners of the company
Non-controlling interest
Assets (162) (209) (85)
Liabilities (161) (209) (85)
Net book values of property, plant and equipment
Increases in property, plant and equipment and right-of-use assets
Impairment of property, plant and equipment, intangible assets and inventories  
Profit (loss) of the year from continuing operations  
Loss of the year from discontinued operations  
Consolidateds [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 1,478 1,270 956
Revenue - foreign market 351 238 117
Intersegment revenue
Cost of sales (1,148) (955) (663)
Gross profit 681 553 410
Selling expenses (56) (33) (26)
Administrative expenses (138) (99) (93)
Other operating income 131 105 51
Other operating expenses (46) (58) (36)
Impairment of property, plant and equipment, intangible assets and inventories (38)    
Impairment of financial assets (8) (2) (9)
Share of profit from associates and joint ventures 105 117 85
Operating income (loss) 631 579 243
Financial income 5 10 9
Financial costs (221) (185) (177)
Other financial results 166 (14) 84
Financial results, net (50) (189) (84)
Profit (loss) before income tax 581 390 159
Income tax (124) (77) (35)
Profit (loss) of the year 457 238 (468)
Depreciation and amortization 212 205 286
Total profit (loss) of the year attributable to:      
Owners of the company 456 273 (367)
Non-controlling interest 1 (35) (101)
Assets 4,742 3,861 4,890
Liabilities 2,458 2,070 3,121
Net book values of property, plant and equipment 2,164 1,659 1,610
Increases in property, plant and equipment and right-of-use assets $ 482 264 242
Impairment of property, plant and equipment, intangible assets and inventories   (4) (139)
Profit (loss) of the year from continuing operations   313 124
Loss of the year from discontinued operations   (75) (592)
Distribution Of Energy [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market  
Revenue - foreign market  
Intersegment revenue  
Cost of sales  
Gross profit  
Selling expenses  
Administrative expenses  
Other operating income  
Other operating expenses  
Impairment of financial assets  
Share of profit from associates and joint ventures  
Operating income (loss)  
Financial income  
Financial costs  
Other financial results  
Financial results, net  
Profit (loss) before income tax  
Income tax  
Profit (loss) of the year   (75) (592)
Depreciation and amortization   81
Total profit (loss) of the year attributable to:      
Owners of the company   (39) (499)
Non-controlling interest   (36) (93)
Assets   1,356
Liabilities   1,021
Net book values of property, plant and equipment  
Increases in property, plant and equipment and right-of-use assets   135
Impairment of property, plant and equipment, intangible assets and inventories  
Profit (loss) of the year from continuing operations  
Loss of the year from discontinued operations   $ (75) $ (592)