Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred income tax assets:
Tax credit carryforwards	$ 858	$ 809
Net operating losses (NOLs)	689	710
Inventories	197	237
Finance lease obligations	317	314
Operating lease liabilities	502	519
Other	195	221
Total deferred income tax assets	2,758	2,810
Valuation allowance	(1,484)	(1,383)
Net deferred income tax assets	1,274	1,427
Deferred income tax liabilities:
Property, plant, and equipment	4,875	5,121
Deferred turnaround costs	450	399
Operating lease ROU assets	467	546
Investments	417	423
Other	332	287
Total deferred income tax liabilities	6,541	6,776
Net deferred income tax liabilities	$ 5,267	$ 5,349