Income Taxes (Income Tax Provision Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Plant Office Closures	$ (13)	$ 52	$ 0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	1	6	55
Asset impairments	0	0	$ (2)
Tax Credit Carryforward, Amount		240
Tax Credit Carryforward, Valuation Allowance	277
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) Net	197
Deferred other tax expense (benefit)	66
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit	7	107
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit)	$ 59
Accumulated but undistributed earnings permanently reinvested in business		$ 3,000
Effective income tax rate	19.00%	20.00%	12.00%
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Valuation Allowance		$ 164
Acetyl Intermediates [Member]
Tax Credit Carryforward [Line Items]
Plant Office Closures		$ 52