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Employee Benefit Plans - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Employee
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Compensation Related Costs Disclosure [Line Items]      
Expenses for defined-contribution plans $ 68 $ 64 $ 66
Net periodic benefit cost (3) $ 1 $ 5
Defined benefit plan, expected future benefit payments in year five $ 33    
Expected years of defined benefit plans 5 years    
Expected future benefit amounts to pay, total $ 319    
United States [Member]      
Compensation Related Costs Disclosure [Line Items]      
Number of U.S. employees participate in defined benefit health care plans | Employee 43    
Number of U.S retirees and spouses participate in defined benefit health care plans | Employee 1,694