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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