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Income Taxes (Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Provision for federal income tax, at statutory rate	$ 70	$ 120	$ 280
State income tax provision, net of federal income tax effect	2	10	28
Foreign income tax rate differential	2	(6)	14
wlk:CARESActTaxBenefit	95	0	0
Depletion	(5)	(5)	(4)
Noncontrolling interests	(9)	(8)	(6)
Change in valuation allowance	3	(17)	(9)
Changes in state apportionment and other state adjustments	(7)	11	(6)
Other, net	(3)	3	3
Provision for (benefit from) income taxes	$ (42)	$ 108	$ 300

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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