Acquisitions and Divestitures Divestiture (EAA Copolymers) (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] - Global Ethylene Acrylic Acid Copolymers and Ionomers [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets					$ 34
Net property					12
Goodwill					23
Net carrying value divested					69
Disposal Group, Including Discontinued Operation, Consideration					$ 296
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 227	$ 0	$ 227	$ 0