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Benefit Obligations
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Benefit Obligations
Benefit Obligations
The components of net periodic benefit cost are as follows:
 
Three Months Ended March 31,
 
 
2015
 
2014
 
 
Pension
Benefits
 
Post-retirement
Benefits
 
Pension
Benefits
 
Post-retirement
Benefits
 
 
(In $ millions)
 
Service cost
3

 
—

 
3

 
—

 
Interest cost
35

 
1

 
42

 
2

 
Expected return on plan assets
(52
)
 
—

 
(54
)
 
—

 
Amortization of prior service cost (credit), net
—

 
—

 
—

 
(19
)
(1) 
Special termination benefit
1

 
—

 
—

 
—

 
Total
(13
)
 
1

 
(9
)
 
(17
)
 
______________________________
(1) 
Primarily related to the elimination of eligibility for all current and future US employees to participate in the Company's US postretirement health care plan.
Benefit obligation funding is as follows:
 
As of
March 31,
2015
 
Total
Expected
2015
 
(In $ millions)
Cash contributions to defined benefit pension plans
21

 
26

Benefit payments to nonqualified pension plans
6

 
22

Benefit payments to other postretirement benefit plans
2

 
17

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

 
6

______________________________
(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.