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Derivative Financial Instruments - Summary of Maturities of Notional Amount of Derivatives (Detail) € in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, R$ in Millions, $ in Millions | Dec. 31, 2018 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 JPY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 JPY (¥)
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Swaps US Dollar-Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | $ | $ 3,490 |  |  |  |  |  | $ 2,800 |  |  |  |
Swaps Yen-US Dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | ¥ |  |  |  |  | ¥ 13,000 |  |  |  |  |  | ¥ 13,000
Swaps Euro-Brazilianreal [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | R$ |  | R$ 300 |  |  |  |  |  | R$ 450 |  |  |
Forwards Brazilian Real - US Dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | R$ |  | 2,823 |  |  |  |  |  |  |  |  |
Forwards Euro- Brazilian real [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | € |  |  | € 150 |  |  |  |  |  | € 400 |  |
Forwards US Dollar - Brazilian real [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | $ | 150 |  |  |  |  |  | 100 |  |  |  |
Forwards Euro-US Dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | € |  |  | 710 |  |  |  |  |  | 204 |  |
Notional amount, Liabilities | € |  |  | 950 |  |  |  |  |  |  |  |
Swaps Dollar- Euro [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | $ | 2,025 |  |  |  |  |  | 2,092 |  |  |  |
Swaps Pound sterling-Euro [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | £ |  |  |  | £ 740 |  |  |  |  |  | £ 740 |
Swap Pound sterling-USDollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | £ |  |  |  | 2,010 |  |  |  |  |  | £ 2,010 |
Forwards US Dollar-Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | $ |  |  |  |  |  |  | $ 1,744 |  |  |  |
Notional amount, Liabilities | $ | 977 |  |  |  |  |  |  |  |  |  |
Put option [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  | 374 |  |  |  |  |  | 374 |  |
Call spread option [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  | 3,000 |  |  |  |  |  | € 3,000 |  |
2019 [member] | Swaps Euro-Brazilianreal [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | € |  |  | 300 |  |  |  |  |  |  |  |
2019 [member] | Forwards Brazilian Real - US Dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | R$ |  | 1,680 |  |  |  |  |  |  |  |  |
2019 [member] | Forwards Euro- Brazilian real [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | € |  |  | 150 |  |  |  |  |  |  |  |
2019 [member] | Forwards US Dollar - Brazilian real [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | $ | 150 |  |  |  |  |  |  |  |  |  |
2019 [member] | Forwards Euro-US Dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | € |  |  | 710 |  |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  | 950 |  |  |  |  |  |  |  |
2019 [member] | Swaps Dollar- Euro [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | $ | 25 |  |  |  |  |  |  |  |  |  |
2019 [member] | Forwards US Dollar-Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | $ | 977 |  |  |  |  |  |  |  |  |  |
2020 [member] | Swap Pound sterling-USDollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | £ |  |  |  | 550 |  |  |  |  |  |  |
2020 [member] | Call spread option [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  | 3,000 |  |  |  |  |  |  |  |
2021 [member] | Forwards Brazilian Real - US Dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | R$ |  | R$ 1,143 |  |  |  |  |  |  |  |  |
2022 [member] | Swaps US Dollar-Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | $ | 1,600 |  |  |  |  |  |  |  |  |  |
2023 and Thereafter [member] | Swaps US Dollar-Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | $ | 1,890 |  |  |  |  |  |  |  |  |  |
2023 and Thereafter [member] | Swaps Yen-US Dollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | ¥ |  |  |  |  |  | ¥ 13,000 |  |  |  |  |
2023 and Thereafter [member] | Swaps Dollar- Euro [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | $ | $ 2,000 |  |  |  |  |  |  |  |  |  |
2023 and Thereafter [member] | Swaps Pound sterling-Euro [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | £ |  |  |  | 740 |  |  |  |  |  |  |
2023 and Thereafter [member] | Swap Pound sterling-USDollar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | £ |  |  |  | £ 1,460 |  |  |  |  |  |  |
2023 and Thereafter [member] | Put option [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  | € 374 |  |  |  |  |  |  |  |

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