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Benefit Obligations
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Benefit Obligations
Benefit Obligations
The components of net periodic benefit cost are as follows:
 
Three Months Ended March 31,
 
2017
 
2016
 
Pension
Benefits
 
Post-retirement
Benefits
 
Pension
Benefits
 
Post-retirement
Benefits
 
(In $ millions)
Service cost
2

 
—

 
2

 
—

Interest cost
27

 
—

 
28

 
1

Expected return on plan assets
(49
)
 
—

 
(44
)
 
—

Amortization of prior service cost (credit), net
—

 
—

 
—

 
(1
)
Special termination benefit
—

 
—

 
1

 
—

Total
(20
)
 
—

 
(13
)
 
—


Benefit obligation funding is as follows:
 
As of
March 31,
2017
 
Total
Expected
2017
 
(In $ millions)
Cash contributions to defined benefit pension plans
5

 
20

Benefit payments to nonqualified pension plans
5

 
22

Benefit payments to other postretirement benefit plans
1

 
4

Cash contributions to German multiemployer defined benefit pension plans(1)
2

 
7

______________________________
(1) 
The Company makes contributions based on specified percentages of employee contributions.
The Company's estimates of its US defined benefit pension plan contributions reflect the provisions of the Pension Protection Act of 2006.