Fair Value Level 4 (Details) - Nonrecurring Fair Value Measurements of Long-lived assets held and used - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairments			$ 0	$ 0	$ 4
Impairment of Long-Lived Assets to be Disposed of			0	0	2
Asset Impairment Charges	$ 0	$ 13	$ (13)	0	6
epoxy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value of Long-Lived Assets held and Used					$ 5
Fair Value of Long-Lived Assets held and Used				1
Asset Impairment Charges				4
FPD [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value of Long-Lived Assets held and Used				2
Fair Value of Long-Lived Assets held and Used				0
Asset Impairment Charges				$ 2