Benefit Obligations (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Costs Recognized

The components of net periodic benefit cost are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	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		1	7		—	6		1
Interest cost	26		1	27		—	78		2	80		1
Expected return on plan assets	(52	)	—	(50	)	—	(157	)	—	(148	)	—
Amortization of prior service cost (credit), net	—		—	—		—	—		—	—		(1	)
Special termination benefit	—		—	—		—	1		—	1		—
Total	(24	)	1	(21	)	1	(71	)	2	(61	)	1

Schedule of Company Commitments to Fund Benefit Obligations

Benefit obligation funding is as follows:

	As of September 30, 2018	Total Expected 2018
	(In $ millions)
Cash contributions to defined benefit pension plans	17	23
Benefit payments to nonqualified pension plans	17	21
Benefit payments to other postretirement benefit plans	1	5
Cash contributions to German multiemployer defined benefit pension plans(1)	6	8