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Employee Benefit Plans - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Employee
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Compensation Related Costs Disclosure [Line Items]      
Expenses for defined-contribution plans $ 70 $ 68 $ 64
Net periodic benefit income (cost) 2 $ 3 $ (1)
Defined benefit plan, expected future benefit payments in year five $ 32    
Expected years of defined benefit plans 5 years    
Expected future benefit amounts to pay, total $ 317    
United States [Member]      
Compensation Related Costs Disclosure [Line Items]      
Number of U.S. employees participate in defined benefit health care plans | Employee 24    
Number of U.S retirees and spouses participate in defined benefit health care plans | Employee 1,912