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Note 14 - Commitments and Contingencies - Personal Injury Liability Activity (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Balance, Current $ 267   $ 242
Personal Injury [Member]      
Balance 361 $ 325  
Current year accruals 52 51  
Changes in estimates for prior years 31 36  
Payments (77) (65)  
Balance 367 347  
Balance, Current $ 98 $ 70