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Note 4 - Schedule of Other Long-Term Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Other Assets Noncurrent Disclosure [Abstract]    
Pension assets $ 347 $ 262
Estimated workers' compensation recoveries 17 18
Long-term receivables 11 11
Other 27 26
Total $ 402 $ 317