Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred income tax assets:
Tax credit carryforwards	$ 660	$ 679
NOLs	642	697
Inventories	326	217
Compensation and employee benefit liabilities	44	123
Environmental liabilities	57	53
Other	186	149
Total deferred income tax assets	1,915	1,918
Valuation allowance	(1,234)	(1,262)
Net deferred income tax assets	681	656
Deferred income tax liabilities:
Property, plant, and equipment	4,708	4,866
Deferred turnaround costs	369	308
Inventories	234	191
Investments	431	268
Other	156	233
Total deferred income tax liabilities	5,898	5,866
Net deferred income tax liabilities	$ 5,217	$ 5,210