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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 189 | $ 25 |  |
Long- term | 5,340 | 6,203 |  |
Total | 5,529 | 6,228 | $ 6,971 | $ 7,379
Floating interest rate [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | 23 | 13 |  |
Long- term | 1,305 | 1,968 |  |
Total | $ 1,328 | $ 1,981 |  |
Short-term | 5.10% | 6.40% |  |
Long-term | 6.00% | 7.10% |  |
Fixed interest rate [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 166 | $ 12 |  |
Long- term | 4,035 | 4,235 |  |
Total | $ 4,201 | $ 4,247 |  |
Short-term | 7.30% | 4.40% |  |
Long-term | 4.60% | 5.00% |  |
US Dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 161 | $ 1 |  |
Long- term | 3,595 | 4,348 |  |
Total | $ 3,756 | $ 4,349 |  |
Effective rate | 5.10% | 5.50% |  |
Euro [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 2 | $ 9 |  |
Long- term | 876 | 990 |  |
Total | $ 878 | $ 999 |  |
Effective rate | 3.90% | 4.20% |  |
Mexican pesos [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 0 | $ 0 |  |
Long- term | 842 | 704 |  |
Total | $ 842 | $ 704 |  |
Effective rate | 11.20% | 12.00% |  |
Philippine pesos [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 0 | $ 11 |  |
Long- term | 0 | 112 |  |
Total | $ 0 | $ 123 |  |
Effective rate | 0.00% | 7.10% |  |
Other Currencies [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 26 | $ 4 |  |
Long- term | 27 | 49 |  |
Total | $ 53 | $ 53 |  |
Effective rate | 5.40% | 4.50% |  |

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