Environmental (Tables)

12 Months Ended

Dec. 31, 2017

Environmental Remediation Obligations [Abstract]

Schedule of Environmental Remediation Reserves

The components of environmental remediation reserves are as follows:



	As of December 31,
	2017	2016
	(In $ millions)
Demerger obligations (Note 24)	28	18
Divestiture obligations (Note 24)	17	16
Active sites	15	16
US Superfund sites	11	11
Other environmental remediation reserves	2	3
Total	73	64

Schedule of Environmental Ownership and Liability Percentages

The Company's ownership interest and environmental liability participation percentages for such liabilities, which cannot be attributed to an InfraServ partner are as follows:



	As of December 31, 2017
	Ownership	Liability	Reserves⁽¹⁾
	(In percentages)		(In $ millions)
InfraServ GmbH & Co. Gendorf KG⁽²⁾	39	10	9
InfraServ GmbH & Co. Hoechst KG	32	40	71
InfraServ GmbH & Co. Knapsack KG⁽²⁾	27	22	1

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⁽¹⁾	Gross reserves maintained by the respective InfraServ entity.