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SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Gross profit $ 597 $ 625 $ 690
Exploration expenses 21 7
Other operating income 175 177 131
Other operating expenses (88) (88) (46)
Impairment of property, plant and equipment, intangible assets and inventories (34) (39) (38)
Impairment of financial assets´  56 4
Share of profit from associates and joint ventures 146 (2) 105
Operating income  440 424 631
Financial income 32 5 5
Other financial results 211 558 166
Financial results, net 58 199 (50)
Profit before income tax 498 623 581
Income tax (121) 318 124
Profit of the year 619 305 457
Total profit of the year attributable to:      
Non-controlling interest 3 1
Owners of the company 619 302 456
Oil And Gas Segment [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 515 402 370
Revenue - foreign market 108 161 159
Intersegment revenue 107 103 117
Cost of sales (515) (412) (350)
Gross profit 215 254 296
Selling expenses (58) (49) (45)
Administrative expenses (82) (74) (60)
Exploration expenses (21) (7)  
Other operating income 87 86 61
Other operating expenses (28) (32) (26)
Impairment of property, plant and equipment, intangible assets and inventories 34   (30)
Impairment of financial assets´  (10)   (2)
Share of profit from associates and joint ventures
Profit from sale of companies´ interest  
Operating income  69 140 194
Financial income 2 2 2
Financial costs (96) (203) (107)
Other financial results (11) (15) (28)
Financial results, net (105) (216) (133)
Profit before income tax (36) (76) 61
Income tax 31 29 (16)
Profit of the year (5) (47) 45
Depreciation and amortization 237 166 125
Total profit of the year attributable to:      
Owners of the company (5)   45
Non-controlling interest
Assets 1,918 1,396 1,234
Liabilities 1,583 1,213 1,248
Net book values of property, plant and equipment 1,183 1,138 807
Increases in property, plant and equipment, intangible assets and right-of-use assets 354 556 324
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories   (38)  
Owners of the company   (47)  
Generation [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 669 648 663
Revenue - foreign market 3
Intersegment revenue
Cost of sales (367) (354) (370)
Gross profit 305 294 293
Selling expenses (3) (2) (3)
Administrative expenses (52) (50) (39)
Exploration expenses  
Other operating income 35 75 25
Other operating expenses (14) (27) (5)
Impairment of property, plant and equipment, intangible assets and inventories  
Impairment of financial assets´  (46)  
Share of profit from associates and joint ventures (21) (18) 65
Profit from sale of companies´ interest  
Operating income  204 272 336
Financial income 8 2 1
Financial costs (53) (119) (82)
Other financial results 183 280 72
Financial results, net 138 163 (9)
Profit before income tax 342 435 327
Income tax 119 (225) (73)
Profit of the year 461 210 254
Depreciation and amortization 100 96 82
Total profit of the year attributable to:      
Owners of the company 461   253
Non-controlling interest 3 1
Assets 3,155 2,684 2,464
Liabilities 857 729 979
Net book values of property, plant and equipment 1,357 1,345 1,299
Increases in property, plant and equipment, intangible assets and right-of-use assets 105 259 115
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories    
Owners of the company   207  
Petrochemicals [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 326 359 425
Revenue - foreign market 190 148 192
Intersegment revenue
Cost of sales (487) (444) (536)
Gross profit 29 63 81
Selling expenses (13) (15) (17)
Administrative expenses (7) (6) (5)
Exploration expenses  
Other operating income 41 13 1
Other operating expenses (7) (7) (6)
Impairment of property, plant and equipment, intangible assets and inventories   (2)
Impairment of financial assets´   
Share of profit from associates and joint ventures
Profit from sale of companies´ interest  
Operating income  43 45 52
Financial income 21
Financial costs (3) (3) (3)
Other financial results 7 15 6
Financial results, net 25 12 3
Profit before income tax 68 57 55
Income tax 4 (27) (15)
Profit of the year 72 30 40
Depreciation and amortization 5 5 5
Total profit of the year attributable to:      
Owners of the company 72   40
Non-controlling interest
Assets 173 157 177
Liabilities 109 137 147
Net book values of property, plant and equipment 28 27 24
Increases in property, plant and equipment, intangible assets and right-of-use assets 6 7 7
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories   (3)  
Owners of the company   30  
Holding Transportation And Others [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 65 14 20
Revenue - foreign market
Intersegment revenue
Cost of sales (17)
Gross profit 48 14 20
Selling expenses
Administrative expenses (98) (55) (38)
Exploration expenses  
Other operating income 12 3 44
Other operating expenses (39) (22) (9)
Impairment of property, plant and equipment, intangible assets and inventories   (6)
Impairment of financial assets´    (2)
Share of profit from associates and joint ventures 167 16 40
Profit from sale of companies´ interest 34 9  
Operating income  124 (33) 49
Financial income 1 7 9
Financial costs (33) (45) (36)
Other financial results 32 278 116
Financial results, net 240 89
Profit before income tax 124 207 138
Income tax (33) (95) (20)
Profit of the year 91 112 118
Depreciation and amortization
Total profit of the year attributable to:      
Owners of the company 91   118
Non-controlling interest
Assets 1,116 631 1,028
Liabilities 518 376 245
Net book values of property, plant and equipment 39 34 34
Increases in property, plant and equipment, intangible assets and right-of-use assets 10 5 36
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories   2  
Owners of the company   112  
Eliminations [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market
Revenue - foreign market
Intersegment revenue (107) (103) (117)
Cost of sales 107 103 117
Gross profit
Selling expenses
Administrative expenses
Exploration 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
Profit from sale of companies´ interest  
Operating income 
Financial income (6) (7)
Financial costs 6 7
Other financial results
Financial results, net
Profit before income tax
Income tax
Profit of the year
Depreciation and amortization
Total profit of the year attributable to:      
Owners of the company  
Non-controlling interest
Assets (17) (146) (161)
Liabilities (17) (146) (161)
Net book values of property, plant and equipment
Increases in property, plant and equipment, intangible assets and right-of-use assets
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories    
Owners of the company    
Consolidateds [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 1,575 1,423 1,478
Revenue - foreign market 301 309 351
Intersegment revenue
Cost of sales (1,279) (1,107) (1,139)
Gross profit 597 625 690
Selling expenses (74) (66) (65)
Administrative expenses (239) (185) (142)
Exploration expenses (21) (7)  
Other operating income 175 177 131
Other operating expenses (88) (88) (46)
Impairment of property, plant and equipment, intangible assets and inventories 34   (38)
Impairment of financial assets´  (56)   (4)
Share of profit from associates and joint ventures 146 (2) 105
Profit from sale of companies´ interest 34 9  
Operating income  440 424 631
Financial income 32 5 5
Financial costs (185) (364) (221)
Other financial results 211 558 166
Financial results, net 58 199 (50)
Profit before income tax 498 623 581
Income tax 121 (318) (124)
Profit of the year 619 305 457
Depreciation and amortization 342 267 212
Total profit of the year attributable to:      
Owners of the company 619   456
Non-controlling interest 3 1
Assets 6,345 4,722 4,742
Liabilities 3,050 2,309 2,458
Net book values of property, plant and equipment 2,607 2,544 2,164
Increases in property, plant and equipment, intangible assets and right-of-use assets $ 475 827 $ 482
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories   (39)  
Owners of the company   $ 302