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Note 5 - Pension and Other Postretirement Benefits - Changes in PBO and Plan Assets (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Projected benefit obligation at beginning of year $ 3,725 $ 5,296  
Service cost 52 93 $ 110
Interest cost 187 123 104
Actuarial loss/(gain) 146 (1,557)  
Gross benefits paid (230) (230)  
Projected benefit obligation at end of year 3,880 3,725 5,296
Fair value of plan assets at beginning of year 4,363 5,554  
Actual return/(loss) on plan assets 235 (992)  
Non-qualified plan benefit contributions 32 31  
Fair value of plan assets at end of year 4,400 4,363 $ 5,554
Funded status at end of year $ 520 $ 638