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COST OF SALES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cost Of Sales      
Inventories at the beginning of the year $ 155 [1] $ 116 $ 153
Plus: Charges of the year      
Purchases of inventories, energy and gas  502 433 153
Salaries and social security charges 79 59 51
Employees benefits 15 13 11
Accrual of defined benefit plans 5 4 4
Works contracts, fees and compensation for services 87 68 55
Property, plant and equipment depreciation 202 194 194
Intangible assets amortization 1 1 5
Right-of-use assets amortization 3 5 1
Energy transportation 8 6 5
Transportation and freights 35 22 20
Consumption of materials 30 26 17
Penalties 1 2
Maintenance 61 52 26
Canons and royalties 89 65 42
Environmental control 5 4 4
Rental and insurance 31 27 23
Surveillance and security 4 3 2
Taxes, rates and contributions 5 4 3
Other 3 6 2
Total charges of the year 1,166 994 618
Exchange differences on translation 8
Less: Inventories at the end of the year (173) (155) (116)
Total cost of sales $ 1,148 $ 955 $ 663
[1] It includes impairment loss as a result of the performed recoverability assessment for US$ 2 million as of December 31, 2022 and 2021, acoording with the policy described in Note 4.13.