Rendering

Component: (Network and Table)
Network
2454407 - Disclosure - Employee Benefit Plans (Schedule of Components of Net Periodic Benefit Cost) (Details)
(http://www.alxn.com/role/EmployeeBenefitPlansScheduleOfComponentsOfNetPeriodicBenefitCostDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000899866 (http://www.sec.gov/CIK)
Compensation and Retirement Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Compensation and Retirement Disclosure [Abstract]
 
 
 
Service cost
8,000,000  
10,000,000  
8,000,000  
Interest cost
0  
1,000,000  
1,000,000  
Expected return on plan assets
0  
(1,000,000) 
(1,000,000) 
Employee contributions
(2,000,000) 
(2,000,000) 
(2,000,000) 
Amortization of prior service costs
0  
0  
0  
Curtailment
0  
(2,000,000) 
0  
Amortization and deferral of actuarial gain
1,000,000  
1,000,000  
1,000,000  
Total net periodic benefit cost
7,000,000  
 
7,000,000  
 
7,000,000