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Derivative Financial Instruments - Schedule of Derivative Financial Instruments Contracted (Detail) $ in Thousands, € in Millions, ¥ in Millions, £ in Millions, R$ in Millions, $ in Millions, $ in Millions | Dec. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 JPY (¥) | Dec. 31, 2019 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 JPY (¥) | Dec. 31, 2019 ARS ($) | Dec. 31, 2018 GBP (£)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value, Asset | $ 20,928,335 | $ 1,049 |  |  |  |  | $ 6,825,760 |  |  |  |  |  |  |
Fair value, Liabilities | (14,230,249) |  |  |  |  |  | (9,596,751) |  |  |  |  |  |  |
Swaps US Dollar-Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset |  | 3,490 |  |  |  |  |  | $ 3,290 |  |  |  |  |  |
Fair value, Asset | 16,806,937 |  |  |  |  |  | 4,420,433 |  |  |  |  |  |  |
Notional amount, Liabilities |  |  |  |  |  |  |  | 200 |  |  |  |  |  |
Fair value, Liabilities |  |  |  |  |  |  | (33,253) |  |  |  |  |  |  |
Swaps Yen-US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | ¥ |  |  |  |  |  | ¥ 9,750 |  |  |  |  |  | ¥ 6,500 |  |
Fair value, Asset | 269,215 |  |  |  |  |  | 262,993 |  |  |  |  |  |  |
Notional amount, Liabilities | ¥ |  |  |  |  |  | ¥ 3,250 |  |  |  |  |  |  |  |
Fair value, Liabilities | (14,802) |  |  |  |  |  |  |  |  |  |  |  |  |
Forwards US Dollar-Mexican peso [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset |  | 240 |  |  |  |  |  | 100 |  |  |  |  |  |
Fair value, Asset | 39,607 |  |  |  |  |  | 18 |  |  |  |  |  |  |
Notional amount, Liabilities |  | 3,494 |  |  |  |  |  | 2,343 |  |  |  |  |  |
Fair value, Liabilities | (4,052,852) |  |  |  |  |  | (1,398,247) |  |  |  |  |  |  |
Forwards US Dollar - Brazilian real [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset |  |  |  |  |  |  |  | 83 |  |  |  |  |  |
Fair value, Asset |  |  |  |  |  |  | 90,429 |  |  |  |  |  |  |
Forwards Brazilian Real - US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | R$ |  |  |  | R$ 4,193 |  |  |  |  |  | R$ 5,803 |  |  |  |
Fair value, Asset | 1,190,292 |  |  |  |  |  | 1,620,605 |  |  |  |  |  |  |
Notional amount, Liabilities | R$ |  |  |  | R$ 1,762 |  |  |  |  |  |  |  |  |  |
Fair value, Liabilities | (425,249) |  |  |  |  |  |  |  |  |  |  |  |  |
Forwards Euro- Brazilian real [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | € |  |  |  |  |  |  |  |  | € 50 |  |  |  |  |
Fair value, Asset |  |  |  |  |  |  | 4,255 |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  |  |  |  |  |  |  | 140 |  |  |  |  |
Fair value, Liabilities |  |  |  |  |  |  | (10,196) |  |  |  |  |  |  |
Forwards Euro-US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | € |  |  | € 915 |  |  |  |  |  | 1,506 |  |  |  |  |
Fair value, Asset | 266,639 |  |  |  |  |  | 204,241 |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  |  |  |  |  |  |  | 1,094 |  |  |  |  |
Fair value, Liabilities |  |  |  |  |  |  | (554,278) |  |  |  |  |  |  |
Swaps Dollar- Euro [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities |  | 800 |  |  |  |  |  | 800 |  |  |  |  |  |
Fair value, Liabilities | (4,811,031) |  |  |  |  |  | (2,228,287) |  |  |  |  |  |  |
Swaps Pound sterling-Euro [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | £ |  |  |  |  | £ 640 |  |  |  |  |  | £ 640 |  |  |
Fair value, Liabilities | (3,122,492) |  |  |  |  |  | (2,201,997) |  |  |  |  |  |  |
Swap Pound sterling-USDollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | £ |  |  |  |  |  |  |  |  |  |  | £ 100 |  |  |
Notional amount, Liabilities | £ |  |  |  |  | 550 |  |  |  |  |  |  |  |  | £ 2,010
Fair value, Liabilities | (457,559) |  |  |  |  |  | (3,019,255) |  |  |  |  |  |  |
Put option [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  | 374 |  |  |  |  |  | 374 |  |  |  |  |
Fair value, Liabilities | (1,073,990) |  |  |  |  |  | (126,569) |  |  |  |  |  |  |
Call option [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  |  |  |  |  |  |  | € 3,000 |  |  |  |  |
Fair value, Liabilities |  |  |  |  |  |  | (2,113) |  |  |  |  |  |  |
Swaps US Dollar- Euro [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset |  | $ 150 |  |  |  |  |  | 150 |  |  |  |  |  |
Fair value, Asset | 117,726 |  |  |  |  |  | 96,967 |  |  |  |  |  |  |
Swaps Pound sterling – US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset | £ |  |  |  |  | £ 1,010 |  |  |  |  |  |  |  |  |
Fair value, Asset | 2,237,919 |  |  |  |  |  | 2,988 |  |  |  |  |  |  |
Forwards Argentinean Peso – US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Asset |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,388 |
Fair value, Asset |  |  |  |  |  |  | 122,831 |  |  |  |  |  |  |
Forwards US Dollar - Euro [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities |  |  |  |  |  |  |  | $ 20 |  |  |  |  |  |
Fair value, Liabilities |  |  |  |  |  |  | (3,787) |  |  |  |  |  |  |
Forwards Yen - US Dollar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | ¥ |  |  |  |  |  |  |  |  |  |  |  | ¥ 6,500 |  |
Fair value, Liabilities |  |  |  |  |  |  | $ (18,769) |  |  |  |  |  |  |
Forwards Euro - Mexican Peso [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, Liabilities | € |  |  | € 200 |  |  |  |  |  |  |  |  |  |  |
Fair value, Liabilities | $ (272,274) |  |  |  |  |  |  |  |  |  |  |  |  |

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