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SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Gross profit $ 625 $ 690 $ 557
Exploration expenses 7
Other operating income 177 131 105
Other operating expenses (88) (46) (58)
Share of profit from associates and joint ventures (2) 105 100
Operating income  424 631 579
Financial income 5 5 10
Other financial results 558 166 (14)
Financial results, net 199 (50) (189)
Profit before income tax 623 581 390
Profit (loss) of the year 305 457 238
Total profit (loss) of the year attributable to:      
Owners of the company 302 456 273
Non-controlling interest 3 1 (35)
Profit of the year from continuing operations 305 457 313
Loss of the year from discontinued operations (75)
Generation [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 648 663 656
Revenue - foreign market
Intersegment revenue
Cost of sales (354) (370) (355)
Gross profit 294 293 301
Selling expenses (2) (3) (2)
Administrative expenses (50) (39) (31)
Exploration expenses    
Other operating income 75 25 42
Other operating expenses (27) (5) (5)
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories    
Share of profit from associates and joint ventures (18) 65 47
Profit from sale of companies´ interest    
Operating income  272 336 350
Financial income 2 1 4
Financial costs (119) (82) (46)
Other financial results 280 72 (14)
Financial results, net 163 (9) (56)
Profit before income tax 435 327 294
Income tax (225) (73) (75)
Profit (loss) of the year 210 254 219
Depreciation and amortization 96 82 88
Total profit (loss) of the year attributable to:      
Owners of the company 207 253 218
Non-controlling interest 3 1 1
Assets 2,684 2,464 1,670
Liabilities 729 979 525
Net book values of property, plant and equipment 1,345 1,299 969
Increases in property, plant and equipment and right-of-use assets 259    
Impairment of property, plant and equipment, intangible assets and inventories    
Impairment of financial assets    
Increases in property, plant and equipment, intangible assets and right-of-use assets   115 39
Impairment of intangible assets and inventories     (2)
Recovery of impairment of financial assets    
Profit from acquisition of companies´ interest      
Profit of the year from continuing operations     219
Loss of the year from discontinued operations    
Oil And Gas Segment [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 402 370 282
Revenue - foreign market 161 159 58
Intersegment revenue 103 117 113
Cost of sales (412) (350) (285)
Gross profit 254 296 168
Selling expenses (49) (45) (22)
Administrative expenses (74) (60) (46)
Exploration expenses (7)    
Other operating income 86 61 58
Other operating expenses (32) (26) (28)
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories (38)    
Share of profit from associates and joint ventures
Profit from sale of companies´ interest    
Operating income  140 194 130
Financial income 2 2 3
Financial costs (203) (107) (103)
Other financial results (15) (28) (16)
Financial results, net (216) (133) (116)
Profit before income tax (76) 61 14
Income tax 29 (16) 8
Profit (loss) of the year (47) 45 22
Depreciation and amortization 166 125 114
Total profit (loss) of the year attributable to:      
Owners of the company (47) 45 22
Non-controlling interest
Assets 1,396 1,234 1,157
Liabilities 1,213 1,248 1,324
Net book values of property, plant and equipment 1,138 807 636
Increases in property, plant and equipment and right-of-use assets 556    
Impairment of property, plant and equipment, intangible assets and inventories   (30)  
Impairment of financial assets   (2)  
Increases in property, plant and equipment, intangible assets and right-of-use assets   324 213
Impairment of intangible assets and inventories    
Recovery of impairment of financial assets    
Profit from acquisition of companies´ interest      
Profit of the year from continuing operations     22
Loss of the year from discontinued operations    
Petrochemicals [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 359 425 310
Revenue - foreign market 148 192 180
Intersegment revenue
Cost of sales (444) (536) (424)
Gross profit 63 81 66
Selling expenses (15) (17) (13)
Administrative expenses (6) (5) (4)
Exploration expenses    
Other operating income 13 1 1
Other operating expenses (7) (6) (3)
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories (3)    
Share of profit from associates and joint ventures
Profit from sale of companies´ interest    
Operating income  45 52 45
Financial income
Financial costs (3) (3) (3)
Other financial results 15 6 (2)
Financial results, net 12 3 (5)
Profit before income tax 57 55 40
Income tax (27) (15) (12)
Profit (loss) of the year 30 40 28
Depreciation and amortization 5 5 3
Total profit (loss) of the year attributable to:      
Owners of the company 30 40 28
Non-controlling interest
Assets 157 177 176
Liabilities 137 147 166
Net book values of property, plant and equipment 27 24 22
Increases in property, plant and equipment and right-of-use assets 7    
Impairment of property, plant and equipment, intangible assets and inventories   (2)  
Impairment of financial assets    
Increases in property, plant and equipment, intangible assets and right-of-use assets   7 6
Impairment of intangible assets and inventories     (2)
Recovery of impairment of financial assets    
Profit from acquisition of companies´ interest      
Profit of the year from continuing operations     28
Loss of the year from discontinued operations    
Holding And Others [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 14 20 22
Revenue - foreign market
Intersegment revenue
Cost of sales
Gross profit 14 20 22
Selling expenses
Administrative expenses (55) (38) (21)
Exploration expenses    
Other operating income 3 44 4
Other operating expenses (22) (9) (22)
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories 2    
Share of profit from associates and joint ventures 16 40 53
Profit from sale of companies´ interest 9    
Operating income  (33) 49 54
Financial income 7 9 4
Financial costs (45) (36) (34)
Other financial results 278 116 18
Financial results, net 240 89 (12)
Profit before income tax 207 138 42
Income tax (95) (20) 2
Profit (loss) of the year 112 118 44
Depreciation and amortization
Total profit (loss) of the year attributable to:      
Owners of the company 112 118 44
Non-controlling interest
Assets 631 1,029 1,067
Liabilities 376 245 264
Net book values of property, plant and equipment 34 34 32
Increases in property, plant and equipment and right-of-use assets 5    
Impairment of property, plant and equipment, intangible assets and inventories   (6)  
Impairment of financial assets   (2)  
Increases in property, plant and equipment, intangible assets and right-of-use assets   36 6
Impairment of intangible assets and inventories    
Recovery of impairment of financial assets     1
Profit from acquisition of companies´ interest       17
Profit of the year from continuing operations     44
Loss of the year from discontinued operations    
Eliminations [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market
Revenue - foreign market
Intersegment revenue (103) (117) (113)
Cost of sales 103 117 113
Gross profit
Selling expenses
Administrative expenses
Exploration expenses    
Other operating income
Other operating expenses
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories    
Share of profit from associates and joint ventures
Profit from sale of companies´ interest    
Operating income 
Financial income (6) (7) (1)
Financial costs 6 7 1
Other financial results
Financial results, net
Profit 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 (146) (162) (209)
Liabilities (146) (161) (209)
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    
Impairment of financial assets    
Increases in property, plant and equipment, intangible assets and right-of-use assets  
Impairment of intangible assets and inventories    
Recovery of impairment of financial assets    
Profit from acquisition of companies´ interest      
Profit of the year from continuing operations    
Loss of the year from discontinued operations    
Consolidateds [Member]      
IfrsStatementLineItems [Line Items]      
Revenue - local market 1,423 1,478 1,270
Revenue - foreign market 309 351 238
Intersegment revenue
Cost of sales (1,107) (1,139) (951)
Gross profit 625 690 557
Selling expenses (66) (65) (37)
Administrative expenses (185) (142) (102)
Exploration expenses (7)    
Other operating income 177 131 105
Other operating expenses (88) (46) (58)
(Impairment) Recovery of impairment of property, plant and equipment, intangible assets and inventories (39)    
Share of profit from associates and joint ventures (2) 105 100
Profit from sale of companies´ interest 9    
Operating income  424 631 579
Financial income 5 5 10
Financial costs (364) (221) (185)
Other financial results 558 166 (14)
Financial results, net 199 (50) (189)
Profit before income tax 623 581 390
Income tax (318) (124) (77)
Profit (loss) of the year 305 457 238
Depreciation and amortization 267 212 205
Total profit (loss) of the year attributable to:      
Owners of the company 302 456 273
Non-controlling interest 3 1 (35)
Assets 4,722 4,742 3,861
Liabilities 2,309 2,458 2,070
Net book values of property, plant and equipment 2,544 2,164 1,659
Increases in property, plant and equipment and right-of-use assets $ 827    
Impairment of property, plant and equipment, intangible assets and inventories   (38)  
Impairment of financial assets   (4)  
Increases in property, plant and equipment, intangible assets and right-of-use assets   $ 482 264
Impairment of intangible assets and inventories     (4)
Recovery of impairment of financial assets     1
Profit from acquisition of companies´ interest       17
Profit of the year from continuing operations     313
Loss of the year from discontinued operations     (75)
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    
Share of profit from associates and joint ventures    
Operating income     
Financial income    
Financial costs    
Other financial results    
Financial results, net    
Profit before income tax    
Income tax    
Profit (loss) of the year     (75)
Depreciation and amortization    
Total profit (loss) of the year attributable to:      
Owners of the company     (39)
Non-controlling interest     (36)
Assets    
Liabilities    
Net book values of property, plant and equipment    
Increases in property, plant and equipment, intangible assets and right-of-use assets    
Impairment of intangible assets and inventories    
Recovery of impairment of financial assets    
Profit from acquisition of companies´ interest      
Profit of the year from continuing operations    
Loss of the year from discontinued operations     $ (75)