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Note 14 - Commitments and Contingencies - Personal Injury Liability Activity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Balance, Current $ 202   $ 187
Personal Injury [Member]      
Balance 325 $ 270  
Current year accruals 23 18  
Changes in estimates for prior years 6 21  
Payments (22) (16)  
Balance 332 293  
Balance, Current $ 67 $ 60