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Financial Instruments - Additional Information (Detail) R$ in Millions, $ in Millions, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 06, 2019 USD ($) | Dec. 06, 2019 BRL (R$) | Dec. 06, 2016 BRL (R$) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Borrowings |  |  |  | $ 114,016 | $ 126,228 |
Borrowings, interest rate |  |  |  |  | 0.40% |
Brazil, Brazil Real |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Promissory notes paid | R$ |  | R$ 1,002 |  |  |  |
United States of America, Dollars |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Promissory notes paid | $ 236 |  |  |  |  |
Mexico, Pesos |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Promissory notes paid |  |  |  | $ 4,670 |  |
Liquidity risk [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Percentage of outstanding consolidated total indebtedness at the level of its sub-holding companies |  |  |  | 64.30% | 68.20% |
Options to purchase foreign currency [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Net premium paid |  |  |  | $ 43 | $ 43 |
Vonpar [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Date of acquisition |  |  | Dec. 06, 2016 |  |  |
Vonpar [member] | Promissory notes [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Borrowings, interest rate |  |  | 0.375% |  |  |
Vonpar [member] | Spal [member] | Promissory notes [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Borrowings, maturity |  |  | three-year |  |  |
Borrowings | R$ |  |  | R$ 1,166 |  |  |
Borrowings, interest rate |  |  | 0.375% |  |  | 0.375%

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