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Note 4 - Retirement Plans - Components of Net Periodic Pension and OPEB Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net periodic pension (benefit)/cost $ (2) $ 5 $ (3) $ 11
Pension Plan [Member]        
Service cost 12 26 25 52
Interest cost 46 31 92 62
Expected return on plan assets (62) (73) (124) (146)
Amortization of actuarial loss $ 2 $ 21 $ 4 $ 43