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Note 17 - Commitments and Contingencies - Personal Injury Liability Activity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance, Current $ 187 $ 177  
Personal Injury [Member]      
Balance 270 265 $ 271
Current year accruals 93 72 78
Changes in estimates for prior years 48 (3) (11)
Payments (86) (64) (73)
Balance 325 270 265
Balance, Current $ 64 $ 60 $ 63