Environmental (Schedule of Environmental Ownership and Liability Percentages) (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Environmental Disclosure [Line Items]
Reserves		$ 69	$ 61
InfraServ GmbH & Co. Gendorf KG [Member]
Environmental Disclosure [Line Items]
Ownership percentage		30.00%
Liability percentage		10.00%
Reserves	[1]	$ 11
InfraServ Gmbh & Co. Hoechst KG [Member]
Environmental Disclosure [Line Items]
Ownership percentage		31.00%
Liability percentage		40.00%
Reserves	[1]	$ 76
YNCORIS GmbH & Co. KG [Member]
Environmental Disclosure [Line Items]
Ownership percentage	[2]	22.00%
Liability percentage	[2]	22.00%
Reserves	[1],[2]	$ 1

[1] Gross reserves maintained by the respective entity.

[2] Formerly known as InfraServ GmbH & Co. Knapsack KG.