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Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Disclosure of fair value of plan assets [line items] |  |  |
Cash | $ 24 | $ 38 |
Investments in corporate bonds | 402 | 296 |
Investments in government bonds | 323 | 356 |
Total fixed-income securities | 749 | 690 |
Investment in marketable securities | 222 | 268 |
Other investments and private funds | 304 | 250 |
Total variable-income securities | 526 | 518 |
Total plan assets | 1,275 | 1,208 | $ 1,784
Level 1 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 24 | 38 |
Investments in corporate bonds | 11 | 7 |
Investments in government bonds | 114 | 90 |
Total fixed-income securities | 149 | 135 |
Investment in marketable securities | 179 | 226 |
Other investments and private funds | 70 | 91 |
Total variable-income securities | 249 | 317 |
Total plan assets | 398 | 452 |
Level 2 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Investments in corporate bonds | 391 | 289 |
Investments in government bonds | 209 | 266 |
Total fixed-income securities | 600 | 555 |
Investment in marketable securities | 43 | 42 |
Other investments and private funds | 33 | 42 |
Total variable-income securities | 76 | 84 |
Total plan assets | 676 | 639 |
Level 3 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Other investments and private funds | 201 | 117 |
Total variable-income securities | 201 | 117 |
Total plan assets | $ 201 | $ 117 |

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