Benefit Obligations

6 Months Ended

Jun. 30, 2021

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,
	2021		2020		2021		2020
	Pension Benefits	Post-retirement Benefits	Pension Benefits	Post-retirement Benefits	Pension Benefits	Post-retirement Benefits	Pension Benefits	Post-retirement Benefits
	(In $ millions)
Service cost	3	1	3	—	7	1	6	—
Interest cost	14	—	21	—	27	—	42	1
Expected return on plan assets	(52)	—	(49)	—	(103)	—	(99)	—
Special termination benefit	—	—	1	—	—	—	1	—
Total	(35)	1	(24)	—	(69)	1	(50)	1

Benefit obligation funding is as follows:

	As of June 30, 2021	Total Expected 2021
	(In $ millions)
Cash contributions to defined benefit pension plans	11	23
Benefit payments to nonqualified pension plans	11	20
Benefit payments to other postretirement benefit plans	2	4
Cash contributions to German multiemployer defined benefit pension plans(1)	4	9

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

The Company's estimates of its U.S. defined benefit pension plan contributions reflect the provisions of the Pension Protection Act of 2006.