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Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of fair value of plan assets [line items] |  |  |
Cash | $ 25 | $ 24 |
Investments in corporate bonds | 283 | 402 |
Investments in government bonds | 339 | 323 |
Total fixed-income securities | 647 | 749 |
Investment in marketable securities | 200 | 222 |
Other investments and private funds | 298 | 304 |
Total variable-income securities | 498 | 526 |
Total plan assets | 1,145 | 1,275 | $ 1,208
Level 1 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 25 | 24 |
Investments in corporate bonds | 237 | 11 |
Investments in government bonds | 339 | 114 |
Total fixed-income securities | 601 | 149 |
Investment in marketable securities | 127 | 179 |
Other investments and private funds | 44 | 70 |
Total variable-income securities | 171 | 249 |
Total plan assets | 772 | 398 |
Level 2 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Investments in corporate bonds | 46 | 391 |
Investments in government bonds | 0 | 209 |
Total fixed-income securities | 46 | 600 |
Investment in marketable securities | 73 | 43 |
Other investments and private funds | 32 | 33 |
Total variable-income securities | 105 | 76 |
Total plan assets | 151 | 676 |
Level 3 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Other investments and private funds | 222 | 201 |
Total variable-income securities | 222 | 201 |
Total plan assets | $ 222 | $ 201 |

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