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Benefit Obligations (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Costs Recognized
The components of net periodic benefit cost are as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
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

 
—

 
2

 
—

 
4

 
—

 
4

 
—

Interest cost
26

 
1

 
28

 
—

 
53

 
1

 
56

 
1

Expected return on plan assets
(49
)
 
—

 
(44
)
 
—

 
(98
)
 
—

 
(88
)
 
—

Amortization of prior service cost (credit), net
—

 
(1
)
 
—

 
(1
)
 
—

 
(1
)
 
—

 
(2
)
Special termination benefit
1

 
—

 
2

 
—

 
1

 
—

 
3

 
—

Total
(20
)
 
—

 
(12
)
 
(1
)
 
(40
)
 
—

 
(25
)
 
(1
)
Schedule of Company Commitments to Fund Benefit Obligations
Benefit obligation funding is as follows:
 
As of
June 30,
2017
 
Total
Expected
2017
 
(In $ millions)
Cash contributions to defined benefit pension plans
11

 
20

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)
3

 
7

______________________________
(1) 
The Company makes contributions based on specified percentages of employee contributions.