Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred income tax assets:
Tax credit carryforwards	$ 924	$ 858
Net operating losses (NOLs)	632	689
Inventories	159	197
Finance lease obligations	633	607
Operating lease liabilities	210	212
Other	226	195
Total deferred income tax assets	2,784	2,758
Valuation allowance	(1,507)	(1,484)
Net deferred income tax assets	1,277	1,274
Deferred income tax liabilities:
Property, plant, and equipment	4,871	5,131
Deferred turnaround costs	428	450
Operating lease ROU assets	199	211
Investments	437	417
Other	488	332
Total deferred income tax liabilities	6,423	6,541
Net deferred income tax liabilities	$ 5,146	$ 5,267