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Benefit Obligations
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Benefit Obligations Benefit Obligations
The components of net periodic benefit cost are as follows:
 
Three Months Ended March 31,
 
2020
 
2019
 
Pension
Benefits
 
Post-retirement
Benefits
 
Pension
Benefits
 
Post-retirement
Benefits
 
(In $ millions)
Service cost
3

 
—

 
2

 
—

Interest cost
21

 
1

 
29

 
—

Expected return on plan assets
(50
)
 
—

 
(46
)
 
—

Total
(26
)
 
1

 
(15
)
 
—


Benefit obligation funding is as follows:
 
As of
March 31,
2020
 
Total
Expected
2020
 
(In $ millions)
Cash contributions to defined benefit pension plans
6

 
23

Benefit payments to nonqualified pension plans
5

 
20

Benefit payments to other postretirement benefit plans
1

 
5

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

 
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.