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Note 12 - Employee Benefit Plans - Components of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Amortization of actuarial loss $ 7 $ 7 $ 14 $ 14
Pension Plan [Member]        
Service cost 6 7 12 13
Interest cost 23 23 46 45
Expected return on assets (33) (33) (66) (64)
Amortization of prior service benefit (1) (2) (2) (3)
Amortization of actuarial loss 7 7 14 14
Net periodic benefit cost (credit) 2 2 4 4
Settlement gain     0 (1)
Other Postretirement Benefits Plan [Member]        
Service cost 0 0 0 0
Interest cost 0 0 1 1
Expected return on assets 0 0 0 0
Amortization of prior service benefit (1) 0 (2) (1)
Amortization of actuarial loss 0 0 0 0
Net periodic benefit cost (credit) $ (1) $ 0 (1) 0
Settlement gain     $ 0 $ 0