Note 4 - Schedule of Other Long-Term Assets (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Other Assets Noncurrent Disclosure [Abstract]
Pension assets	$ 290	$ 262
Estimated workers' compensation recoveries	18	18
Long-term receivables	11	11
Other	27	26
Total	$ 346	$ 317