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Note 8 - Employee Retirement Plans - Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Plan [Member]        
Service cost $ 27 $ 32 $ 50 $ 64
Interest cost 43 27 88 54
Expected return on plan assets (46) (54) (92) (109)
Amortization of actuarial net gain
Amortization of prior service cost (credit) 1 2 3 3
Recognition of actuarial loss (gain) 22 22
Special termination benefit charge 5 5
Total pension and postretirement benefit expense 30 29 54 34
Other Postretirement Benefits Plan [Member]        
Service cost 2 2 3 4
Interest cost 5 4 11 8
Expected return on plan assets
Amortization of actuarial net gain (6) (11)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Recognition of actuarial loss (gain) (1) (1)
Special termination benefit charge
Total pension and postretirement benefit expense $ 0 $ 4 $ 1 $ 9