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Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of fair value of plan assets [line items] |  |  |
Cash | $ 33 | $ 44 |
Investments in corporate bonds | 433 | 475 |
Investments in government bonds | 478 | 457 |
Total fixed-income securities | 944 | 976 |
Investment in marketable securities | 489 | 430 |
Other investments and private funds | 351 | 288 |
Total variable-income securities | 840 | 718 |
Total plan assets | 1,784 | 1,694 | $ 1,600
Level 1 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 33 | 44 |
Investments in corporate bonds | 1 | 1 |
Investments in government bonds | 85 | 86 |
Total fixed-income securities | 119 | 131 |
Investment in marketable securities | 380 | 341 |
Other investments and private funds | 163 | 146 |
Total variable-income securities | 543 | 487 |
Total plan assets | 662 | 618 |
Level 2 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 0 | 0 |
Investments in corporate bonds | 432 | 474 |
Investments in government bonds | 393 | 371 |
Total fixed-income securities | 825 | 845 |
Investment in marketable securities | 109 | 89 |
Other investments and private funds | 88 | 55 |
Total variable-income securities | 197 | 144 |
Total plan assets | 1,022 | 989 |
Level 3 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Other investments and private funds | 100 | 87 |
Total variable-income securities | 100 | 87 |
Total plan assets | $ 100 | $ 87 |

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