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Relevant event during the period and as of the issuance date of the financial statements - Additional Information (Detail) - USD ($) | 1 Months Ended | 2 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement [line items] |  |  |  |  |  |
Incremental costs and covid nineteen expenses |  |  |  | $ 48,000,000 |  |
Impairment loss |  |  |  | 306,000,000 | $ 64,000,000 | $ 23,000,000
Revolving line of credit [member] |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |
Available borrowing facility | $ 1,121 |  |  | 1,121 |  |
COVID-19 [member] |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |
Incremental costs and covid nineteen expenses |  |  |  | $ 48,000,000 |  |
Percentage increase decrease in revenue |  |  |  | 1.20% |  |
Percentage increase decrease in cost of sales |  |  |  | 0.40% |  |
Percentage increase decrease in operating costs and expenses |  |  |  | 4.60% |  |
Increase decrease in profit (loss) before income tax, depreciation and amortisation |  |  |  | 0.30% |  |
Impairment loss |  |  |  | $ 1,520 |  |
Proceeds from notes |  |  | $ 3,478 |  |  |
Repayments of notes | $ 2,785 |  |  |  |  |
Salary forgo period |  | 90 days |  |  |  |
COVID-19 [member] | BOD chairman CEO and executive committee [member] |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |
Monthly salary forgo percent |  | 25.00% |  |  |  |
COVID-19 [member] | Board of directors [member] |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |
Monthly salary forgo percent |  | 25.00% |  |  |  |
COVID-19 [member] | Senior executives [member] |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |
Monthly salary forgo percent |  | 15.00% |  |  |  |
COVID-19 [member] | Other employees [member] |  |  |  |  |  |
Statement [line items] |  |  |  |  |  |
Monthly salary deferrment percent |  | 10.00% |  |  |  |

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