Note 6 - Income Taxes - Tax Effects of Temporary Differences and Carryforwards of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loss and tax credit carryforwards		$ 275	$ 281
Other assets		245	232
Research and development capitalization		362	280
Asset impairments and restructuring reserves		43	41
Postretirement medical and life benefits		103	102
Other accrued liabilities		319	311
Other employee benefits		344	346
Gross deferred tax assets		1,691	1,593
Valuation allowances		(207)	(166)	$ (138)	$ (167)
Total deferred tax assets		1,484	1,427
Intangible and other assets		(117)	(108)
Fixed assets		(223)	(289)
Finance leases		(209)	(200)
Total deferred tax liabilities		(549)	(597)
Net deferred tax assets	[1]	$ 935	$ 830

[1] The Company also has Luxembourg deferred tax asset net operating losses of up to $3.1 billion that have a remote possibility of realization and therefore, are not recognized in the deferred tax table above.