Environmental (Schedule of Environmental Ownership and Liability Percentages) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Environmental Disclosure [Line Items]
Reserves		$ 72	$ 84
InfraServ GmbH & Co. Gendorf KG [Member]
Environmental Disclosure [Line Items]
Ownership percentage		39.00%
Liability percentage		10.00%
Reserves	[1]	$ 10
InfraServ GmbH & Co. Hoechst KG [Member]
Environmental Disclosure [Line Items]
Ownership percentage		32.00%
Liability percentage		40.00%
Reserves	[1]	$ 64
InfraServ GmbH & Co. Knapsack KG [Member]
Environmental Disclosure [Line Items]
Ownership percentage		27.00%
Liability percentage		22.00%
Reserves	[1]	$ 1

[1] Gross reserves maintained by the respective InfraServ entity.