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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 179 | $ 62 |  |
Long- term | 9,160 | 9,303 |  |
Total | 9,339 | 9,365 | $ 9,311 | $ 9,873
Floating interest rate [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | 172 | 59 |  |
Long- term | 2,538 | 2,997 |  |
Total | $ 2,710 | $ 3,056 |  |
Short-term | 3.10% | 4.30% |  |
Long-term | 4.00% | 4.10% |  |
Fixed interest rate [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 7 | $ 3 |  |
Long- term | 6,622 | 6,306 |  |
Total | $ 6,629 | $ 6,309 |  |
Short-term | 4.70% | 5.20% |  |
Long-term | 5.60% | 5.50% |  |
US Dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 6 | $ 25 |  |
Long- term | 6,089 | 6,144 |  |
Total | $ 6,095 | $ 6,169 |  |
Effective rate | 5.80% | 5.20% |  |
Euro [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 73 | $ 3 |  |
Long- term | 2,078 | 2,438 |  |
Total | $ 2,151 | $ 2,441 |  |
Effective rate | 2.70% | 3.10% |  |
Pounds [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 55 | $ 23 |  |
Long- term | 329 | 433 |  |
Total | $ 384 | $ 456 |  |
Effective rate | 2.50% | 3.20% |  |
Philippine pesos [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 3 | $ 3 |  |
Long- term | 220 | 221 |  |
Total | $ 223 | $ 224 |  |
Effective rate | 4.10% | 5.20% |  |
Mexican pesos [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Long- term | $ 334 |  |  |
Total | $ 334 |  |  |
Effective rate | 6.80% |  |  |
Other Currencies [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 42 | $ 8 |  |
Long- term | 110 | 67 |  |
Total | $ 152 | $ 75 |  |
Effective rate | 4.90% | 5.60% |  |

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