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Employee Benefits - Summary of Sensitivity Analysis of Defined Benefit Obligation for Weighted Principle Assumption (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Discount Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ (482)
Decrease in assumption $ 533
Price inflation [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 175
Decrease in assumption $ (183)
Future Salary Increases [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 0.50%
Increase in assumption $ 26
Decrease in assumption $ (25)
Medical Cost Trend Rate [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption 1.00%
Increase in assumption $ 30
Decrease in assumption $ (26)
Longevity [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Change in assumption One year
Increase in assumption $ 256
Decrease in assumption $ (255)