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Financial Instruments - Additional Information - Risk Management (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items] |  |  |
Reduction in income | $ 87 | $ 76 |
Hypothetic foreign exchange rate strengthening | 10.00% |  |
Financial debt percentage | 65.00% |  |
Decrease in net income due to change in the fair value | $ 3 | 7 |
Current maturities of debt | 105 | 55 |
Other financial obligations | 879 | 1,381 |
Cash flows provided by operating activities from continuing operations | 1,563 | $ 1,282 | $ 1,435
Revolving credit facility | $ 1,121 |  |
Euro [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial debt percentage | 23.00% |  |
Pounds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings, interest rate | 2.50% | 3.20% |
Financial debt percentage | 4.00% |  |
Mexican peso [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial debt percentage | 4.00% |  |
Philippine pesos [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings, interest rate | 4.10% | 5.20% |
Financial debt percentage | 2.00% |  |
Other Currencies [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings, interest rate | 4.90% | 5.60% |
Financial debt percentage | 2.00% |  |
Interest rate risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Reduction in income | $ 17 | $ 19 |
Interest rate risk [member] | Top of range [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings, interest rate | 0.50% | 0.50% |
Interest rate risk [member] | Floating interest rate [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings, interest rate | 17.00% | 22.00% |
Currency risk [member] | Mexico [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 21.00% |  |
Currency risk [member] | United States [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 29.00% |  |
Currency risk [member] | United Kingdom [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 5.00% |  |
Currency risk [member] | Germany [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 4.00% |  |
Currency risk [member] | France [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 6.00% |  |
Currency risk [member] | Spain [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 2.00% |  |
Currency risk [member] | Rest Of Europe Region [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 15.00% |  |
Currency risk [member] | Colombia [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 3.00% |  |
Currency risk [member] | Panama [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 1.00% |  |
Currency risk [member] | Rest of South, Central America and the Caribbean region [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 4.00% |  |
Currency risk [member] | Caribbean Tcl [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 2.00% |  |
Currency risk [member] | Other Operations [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 6.00% |  |
Currency risk [member] | Dominican Republic [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of entity's revenue | 2.00% |  |
Liquidity risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current maturities of debt | $ 1,063 |  |
Other financial obligations | 1,117 |  |
Cash flows provided by operating activities from continuing operations | 1,578 |  |
Liquidity risk [member] | 2017 Credit Agreement [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Revolving credit facility | $ 1,121 |  |

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