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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 73 | $ 179 |  |
Long- term | 7,306 | 9,160 |  |
Total | 7,379 | 9,339 | $ 9,365 | $ 9,311
Floating interest rate [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | 27 | 172 |  |
Long- term | 896 | 2,538 |  |
Total | $ 923 | $ 2,710 |  |
Short-term | 2.70% | 3.10% |  |
Long-term | 2.60% | 4.00% |  |
Fixed interest rate [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 46 | $ 7 |  |
Long- term | 6,410 | 6,622 |  |
Total | $ 6,456 | $ 6,629 |  |
Short-term | 5.20% | 4.70% |  |
Long-term | 4.80% | 5.60% |  |
US Dollar [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 6 | $ 6 |  |
Long- term | 6,375 | 6,089 |  |
Total | $ 6,381 | $ 6,095 |  |
Effective rate | 4.40% | 5.80% |  |
Euro [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 1 | $ 73 |  |
Long- term | 453 | 2,078 |  |
Total | $ 454 | $ 2,151 |  |
Effective rate | 3.10% | 2.70% |  |
British Pound Sterling [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  | $ 55 |  |
Long- term |  | 329 |  |
Total |  | $ 384 |  |
Effective rate |  | 2.50% |  |
Philippine pesos [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term | $ 66 | $ 3 |  |
Long- term | 109 | 220 |  |
Total | $ 175 | $ 223 |  |
Effective rate | 4.40% | 4.10% |  |
Mexican pesos [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Long- term | $ 254 | $ 334 |  |
Total | $ 254 | $ 334 |  |
Effective rate | 7.20% | 6.80% |  |
Other Currencies [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Short- term |  | $ 42 |  |
Long- term | $ 115 | 110 |  |
Total | $ 115 | $ 152 |  |
Effective rate | 4.10% | 4.90% |  |

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