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Benefit Obligations
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Benefit Obligations Benefit Obligations
The components of net periodic benefit cost are as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
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

 
—

 
4

 
—

 
5

 
—

Interest cost
29

 
1

 
26

 
1

 
58

 
1

 
52

 
1

Expected return on plan assets
(47
)
 
—

 
(53
)
 
—

 
(93
)
 
—

 
(105
)
 
—

Special termination benefit
—

 
—

 
1

 
—

 
—

 
—

 
1

 
—

Total
(16
)
 
1

 
(23
)
 
1

 
(31
)
 
1

 
(47
)
 
1


Benefit obligation funding is as follows:
 
As of
June 30,
2019
 
Total
Expected
2019
 
(In $ millions)
Cash contributions to defined benefit pension plans
11

 
22

Benefit payments to nonqualified pension plans
11

 
21

Benefit payments to other postretirement benefit plans
2

 
5

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

 
9

______________________________
(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.