Income Tax Expense (Deferred Tax Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Environmental, asset retirement obligations, and other reserves	$ 0	$ 12
Inventories	0	2
Net operating and other loss carry forwards	4	0
Other	32	49
Total deferred tax assets	36	63
Property and equipment	24	63
Trademarks and other intangibles	72	63
Investments in affiliates	39	15
Deferred Tax Liabilities, Other	10	25
Total deferred tax liabilities	145	166
Net deferred income tax liabilities	$ 109	$ 103