Benefit Obligations

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Benefit Obligations

Benefit Obligations

The components of net periodic benefit cost are as follows:

	Three Months Ended March 31,
	2018			2017
	Pension Benefits		Post-retirement Benefits	Pension Benefits		Post-retirement Benefits
	(In $ millions)
Service cost	2		—	2		—
Interest cost	26		—	27		—
Expected return on plan assets	(52	)	—	(49	)	—
Total	(24	)	—	(20	)	—

Benefit obligation funding is as follows:

	As of March 31, 2018	Total Expected 2018
	(In $ millions)
Cash contributions to defined benefit pension plans	6	23
Benefit payments to nonqualified pension plans	5	21
Benefit payments to other postretirement benefit plans	1	5
Cash contributions to German multiemployer defined benefit pension plans(1)	2	8

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⁽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.