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Benefit Obligations
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Benefit Obligations
Benefit Obligations
Beginning in 2016, the Company elected to use a full yield curve approach in the estimation of the service and interest cost components of net periodic benefit cost by applying the specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows (Note 1). The Company's adoption of the full yield curve approach will reduce 2016 service and interest cost by approximately $29 million as compared to the previous method.
The components of net periodic benefit cost are as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
 
Pension
Benefits
 
Post-retirement
Benefits
 
Pension
Benefits
 
Post-retirement
Benefits
 
Pension
Benefits
 
Post-retirement
Benefits
 
Pension
Benefits
 
Post-retirement
Benefits
 
(In $ millions)
Service cost
2

 
—

 
3

 
1

 
4

 
—

 
6

 
1

Interest cost
28

 
—

 
36

 
—

 
56

 
1

 
71

 
1

Expected return on plan assets
(44
)
 
—

 
(53
)
 
—

 
(88
)
 
—

 
(105
)
 
—

Recognized actuarial (gain) loss
—

 
—

 
—

 
1

 
—

 
—

 
—

 
1

Amortization of prior service cost (credit), net
—

 
(1
)
 
—

 
—

 
—

 
(2
)
 
—

 
—

Special termination benefit
2

 
—

 
—

 
—

 
3

 
—

 
1

 
—

Total
(12
)
 
(1
)
 
(14
)
 
2

 
(25
)
 
(1
)
 
(27
)
 
3


Benefit obligation funding is as follows:
 
As of
June 30,
2016
 
Total
Expected
2016
 
(In $ millions)
Cash contributions to defined benefit pension plans
13

 
23

Benefit payments to nonqualified pension plans
11

 
22

Benefit payments to other postretirement benefit plans
2

 
4

Cash contributions to German multiemployer defined benefit pension plans(1)
4

 
8

______________________________
(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.