Quarterly report [Sections 13 or 15(d)]

Note 12 - Employee Benefit Plans - Components of Net Benefit Costs (Details)

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Note 12 - Employee Benefit Plans - Components of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Amortization of actuarial loss $ 7 $ 8 $ 21 $ 22
Pension Plan [Member]        
Service cost 5 6 17 19
Interest cost 23 22 69 67
Expected return on assets (34) (33) (100) (97)
Amortization of prior service benefit (2) (1) (4) (4)
Amortization of actuarial loss 7 8 21 22
Curtailment gain (1) 0 (1) 0
Net periodic benefit (credit) cost (2) 2 2 6
Settlement gain     0 (1)
Other Postretirement Benefits Plan [Member]        
Service cost 0 0 0 0
Interest cost 1 1 2 2
Expected return on assets 0 0 0 0
Amortization of prior service benefit 0 (1) (2) (2)
Amortization of actuarial loss 0 0 0 0
Curtailment gain 0 0 0 0
Net periodic benefit (credit) cost $ 1 $ 0 0 0
Settlement gain     $ 0 $ 0