Note 6 - Schedule of Other Long-Term Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Assets Noncurrent Disclosure [Abstract]
Pension assets	$ 262	$ 173
Estimated workers' compensation recoveries	18	18
Long-term receivables, net of allowance of $0 million and $4 million	11	11
Other	26	26
Total	$ 317	$ 228