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Employee Benefits - Summary of Net Liability for Post-employment and Long-term Employee Benefit Plans (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [abstract]        
Present value of funded obligations $ (6,791) $ (7,703)    
Fair value of plan assets 5,381 5,649    
Present value of net obligations for funded plans (1,410) (2,054)    
Present value of unfunded obligations (687) (793)    
Present value of net obligations (2,097) (2,847)    
Unrecognized asset (32) (31) $ (74) $ (77)
Net liability (2,129) (2,878)    
Other long term employee benefits (127) (86)    
Net liability (2,256) (2,964)    
Employee benefits amounts in the balance sheet:        
Liabilities (2,261) (2,970)    
Assets 5 6    
Net liability $ (2,256) $ (2,964)