Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred income tax assets:
Tax credit carryforwards	$ 809	$ 660
NOLs	710	642
Inventories	237	326
Compensation and employee benefit liabilities	32	44
Environmental liabilities	59	57
Finance lease obligations	314	309
Operating lease liabilities	519	512
Other	130	186
Total deferred income tax assets	2,810	2,736
Valuation allowance	(1,383)	(1,234)
Net deferred income tax assets	1,427	1,502
Deferred income tax liabilities:
Property, plant, and equipment	5,121	5,022
Deferred turnaround costs	399	369
Operating lease ROU assets	546	507
Inventories	106	234
Investments	423	431
Other	181	156
Total deferred income tax liabilities	6,776	6,719
Net deferred income tax liabilities	$ 5,349	$ 5,217