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Component: (Network and Table)
Network
2354301 - Disclosure - Employee Benefit Plans (Tables)
(http://www.alxn.com/role/EmployeeBenefitPlansTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Compensation and Retirement Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Compensation and Retirement Disclosure [Abstract]
 
Schedule of Change in Benefit Obligation
The following table sets forth the funded status and the amounts recognized for defined benefit plans, including the impacts of the 2015 curtailment:
 
 
December 31,
 
2016
 
2015
Change in benefit obligation:
 
 
 
Projected benefit obligation, beginning of year
$
45

 
$
51

Prior service cost

 

Service cost
8

 
10

Interest cost

 
1

Change in assumptions
(1
)
 
2

Recognized actuarial net loss

 
4

Curtailment

 
(25
)
Plan amendment
(4
)
 

Foreign currency exchange rate changes
(3
)
 

Net transfers to (from) plan

 
2

Other
3

 

Projected benefit obligation, end of year
$
48

 
$
45

Accumulated benefit obligation, end of year
$
41

 
$
42

 
 
Schedule of Change in Plan Assets
 
December 31,
 
2016
 
2015
Change in plan assets:
 
 
 
Fair value of plan assets, beginning of year
$
22

 
$
27

Return on plan assets

 

Employer contributions
3

 
4

Plan participants' contributions
2

 
2

Curtailment

 
(13
)
Foreign currency exchange rate changes
(1
)
 

Net transfers to (from) plan

 
2

Other
2

 

Fair value of plan assets, end of year
$
28

 
$
22

Funded status at end of year
$
(20
)
 
$
(23
)
 
 
Schedule of Fair Value of Plan Assets and Target Asset Allocation
The following table presents total plan assets by investment category as of December 31, 2016 and 2015 and the classification of each investment category within the fair value hierarchy with respect to the inputs used to measure fair value:
 
December 31, 2016
 
December 31, 2015
 
Fair Value
(Level 2)
 
as % of total
plan assets
 
Fair Value
(Level 2)
 
as % of total
plan assets
Cash and cash equivalents
$

 
%
 
$

 
%
Equity security funds
2

 
7
%
 
2

 
9
%
Debt security funds
22

 
79
%
 
17

 
77
%
Real estate funds
4

 
14
%
 
3

 
14
%
 
$
28

 
100
%
 
$
22

 
100
%
 
 
Schedule of Weighted Average Assumptions Used to Calculate Net Periodic Benefit Cost and the Actuarial Present Value of Projected Benefit Obligations
The following table provides the weighted average assumptions used to calculate net periodic benefit cost and the actuarial present value of projected benefit obligations:
 
December 31,
 
2016
 
2015
Weighted average assumptions - Net Periodic Benefit Cost:
 
 
 
Discount rate
0.6
%
 
1.4
%
Long term rate of return on assets
3.0
%
 
3.5
%
Rate of compensation increase
1.4
%
 
1.5
%
Weighted average assumptions - Projected Benefit Obligation:
 
 
 
Discount Rate
0.7
%
 
0.6
%
Rate of compensation increase
1.4
%
 
1.4
%
 
 
Schedule of Components of Net Periodic Benefit Costs
The components of net periodic benefit cost are as follows: 
 
Year Ended December 31,
 
2016
 
2015
 
2014
Service cost
$
8

 
$
10

 
$
8

Interest cost

 
1

 
1

Expected return on plan assets

 
(1
)
 
(1
)
Employee contributions
(2
)
 
(2
)
 
(2
)
Amortization of prior service costs

 

 

Curtailment

 
(2
)
 

Amortization and deferral of actuarial gain
1

 
1

 
1

Total net periodic benefit cost
$
7

 
$
7

 
$
7

 
 
Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Other changes in plan assets and benefit obligations recognized in AOCI are as follows: 
Amount included in AOCI - December 31, 2014
$
(17
)
Prior service cost

Net loss arising during the period
(4
)
Change in assumptions
(2
)
Amortization of net gain
1

Plan assets losses
(1
)
Curtailment
10

Foreign currency exchange rate changes

Taxes
3

Amount included in AOCI - December 31, 2015
$
(10
)
Prior service cost

Net loss arising during the period

Plan amendment
4

Change in assumptions
1

Amortization of net gain
1

Plan assets losses

Curtailment

Foreign currency exchange rate changes

Taxes
(1
)
Other
(2
)
Amount included in AOCI - December 31, 2016
$
(7
)
 
 
Schedule of Estimated Future Benefit Payments
The expected future benefits to be paid in respect of the pension plans as of December 31, 2016 were as follows: 
Year
 
2017
$
2

2018
1

2019
1

2020
1

2021
1

2022 to 2026
5