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Relevant event during the period and as of the issuance date of the financial statements - Additional Information (Detail) - USD ($) $ in Millions |  |  |  |  |  | 1 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 23, 2021 | Oct. 29, 2021 | Jun. 08, 2021 | Dec. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement [line items] |  |  |  |  |  |  |  |  |  |
Incremental costs and covid nineteen expenses |  |  |  |  |  |  |  | $ 26 | $ 48 | $ 0
Asset impairment losses , Previous Year Value |  |  |  |  |  |  |  | 43 | 306 | 64
Emission allowances sold | $ 600 |  |  |  |  |  |  |  |  |
Operating Income Loss, Previous Year Value | 1,618 |  |  |  | $ 456 |  |  | 778 | (1,446) | $ 179
Operating EBITDA Margin, Previous Year Value | 2,421 |  |  |  | $ 2,861 |  |  |  |  |
Issuance Of Subordinated notes for repayment of debt |  |  |  | $ 1,000 |  |  |  |  |  |
the 2021 Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |  |  |  |  |
ProceedsFromClosureOfCreditAgreement Used For settlement of previous agreement |  |  | $ 3,250 |  |  |  |  |  |  |
the 2021 Pesos Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |  |  |  |  |
ProceedsFromClosureOfCreditAgreement Used For settlement of previous agreement |  | $ 250 |  |  |  |  |  |  |  |
Revolving line of credit [member] |  |  |  |  |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |  |  |  |  |
Available borrowing facility | $ 1,750 |  |  |  |  |  |  | 1,750 |  |
COVID-19 [member] |  |  |  |  |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |  |  |  |  |
Incremental costs and covid nineteen expenses |  |  |  |  |  |  |  | $ 26 | 48 |
Increase decrease in profit (loss) before income tax, depreciation and amortisation |  |  |  |  |  |  |  | 18.10% |  |
Asset impairment losses , Previous Year Value |  |  |  |  |  |  |  | $ 536 | $ 1,520 |
Proceeds from notes |  |  |  |  |  |  | $ 3,478 |  |  |
Repayments of notes |  |  |  |  |  | $ 2,785 |  |  |  |
Revenue Increased, computed as a percentage against previous year |  |  |  |  |  |  |  | 14.00% |  |

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