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Note 4 - Retirement Plans - Components of Net Periodic Pension and OPEB Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net periodic pension (benefit)/cost $ 1 $ (1) $ (2) $ 10
Pension Plan [Member]        
Service cost 13 21 38 73
Interest cost 48 31 140 93
Expected return on plan assets (62) (74) (186) (220)
Amortization of actuarial loss $ 2 $ 21 $ 6 $ 64