Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss carryforward	$ 209	$ 50
Credit carryforward	25	24
Operating lease liabilities	96	0
Accruals	65	64
Pension	83	76
Inventories	20	13
Other	26	17
Deferred taxes assets—total	524	244
Property, plant and equipment	(1,017)	(948)
Intangibles	(156)	(148)
Operating lease right-of-use asset	(95)	0
Turnaround costs	(21)	(20)
Consolidated partnerships	(194)	(202)
Equity method investments	(220)	(13)
Other	(18)	(14)
Deferred tax liabilities—total	(1,721)	(1,345)
Valuation allowance	(30)	(47)
Total net deferred tax liabilities	(1,227)	(1,148)
Balance sheet classifications
Noncurrent deferred tax asset	28	11
Noncurrent deferred tax liability	$ (1,255)	$ (1,159)