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Schedule of cost of sales (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Inventories at the beginning of the year $ 116 $ 153 $ 137
Plus: Charges for the year      
Purchases of inventories, energy and gas  433 153 353
Salaries and social security charges 59 51 57
Benefits to employees 13 11 9
Accrual of defined benefit plans 4 4 4
Works contracts, fees and compensation for services 68 55 60
Depreciation of property, plant and equipment 194 194 171
Intangible assets amortization 1 5 6
Right-of-use assets amortization 5 1 2
Transport of energy 6 5 4
Transportation and freights 22 20 22
Consumption of materials 26 17 21
Penalties 2 1
Maintenance 52 26 27
Canons and royalties 65 42 59
Environmental control 4 4 3
Rental and insurance 27 23 21
Surveillance and security 3 2 6
Taxes, rates and contributions 4 3 4
Other 6 2 (4)
Subtotal 994 618 826
Gain on monetary position 8 1
Less: Inventories at the end of the year (155) (116) (153)
Total cost of sales $ 955 $ 663 $ 811