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Employee Benefit Plans - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Employees
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Compensation Related Costs Disclosure [Line Items]      
Expenses for defined-contribution plans $ 95 $ 115 $ 96
Net periodic benefit cost 5 $ 7 $ 10
Defined benefit plan, expected future benefit payments in year five $ 35    
Expected years of defined benefit plans 5 years    
Expected future benefit amounts to pay, total $ 370    
United States [Member]      
Compensation Related Costs Disclosure [Line Items]      
Number of U.S retirees and spouses participate in defined benefit health care plans | Employees 1,900    
Number of U.S. employees participate in defined benefit health care plans | Employees 75    
Norway [Member]      
Compensation Related Costs Disclosure [Line Items]      
Number of active employees participate in defined benefit plan | Employees 300