Income Taxes (Income Tax Provision Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Plant Office Closures	$ 4	$ (13)	$ 52
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	25	1	6
Asset impairments	(83)	0	0
Tax Credit Carryforward, Amount			240
Tax Credit Carryforward, Valuation Allowance	$ 207
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) Net		$ 197
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit			107
Accumulated but undistributed earnings permanently reinvested in business			$ 3,000
Effective income tax rate	13.00%	19.00%	20.00%
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