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Note 12 - Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2026
Notes to Financial Statements |
Retirement Benefits [Text Block] | 12. EMPLOYEE BENEFIT PLANS ​ Components of net periodic benefit cost (credit) for the three and six months ended June 30, 2026 and 2025 were as follows (dollars in millions):
|  |  |  |  |  |  |  |  |  | Other postretirement |
|  | Defined benefit plans |  |  | benefit plans |
|  | Three months ended |  |  | Three months ended |
|  | June 30, |  |  | June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Service cost |  | $ | 6 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 23 |  |  |  | 23 |  |  |  | — |  |  |  | — |
Expected return on assets |  |  | (33 | ) |  |  | (33 | ) |  |  | — |  |  |  | — |
Amortization of prior service benefit |  |  | (1 | ) |  |  | (2 | ) |  |  | (1 | ) |  |  | — |
Amortization of actuarial loss |  |  | 7 |  |  |  | 7 |  |  |  | — |  |  |  | — |
Net periodic benefit cost (credit) |  | $ | 2 |  |  | $ | 2 |  |  | $ | (1 | ) |  | $ | — |
​
|  |  |  |  |  |  |  |  |  | Other postretirement |
|  | Defined benefit plans |  |  | benefit plans |
|  | Six months ended |  |  | Six months ended |
|  | June 30, |  |  | June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Service cost |  | $ | 12 |  |  | $ | 13 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 46 |  |  |  | 45 |  |  |  | 1 |  |  |  | 1 |
Expected return on assets |  |  | (66 | ) |  |  | (64 | ) |  |  | — |  |  |  | — |
Amortization of prior service benefit |  |  | (2 | ) |  |  | (3 | ) |  |  | (2 | ) |  |  | (1 | )
Amortization of actuarial loss |  |  | 14 |  |  |  | 14 |  |  |  | — |  |  |  | — |
Settlement gain |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | — |
Net periodic benefit cost (credit) |  | $ | 4 |  |  | $ | 4 |  |  | $ | (1 | ) |  | $ | — |
During both of the six months ended June 30, 2026 and 2025, we made contributions to our pension and other postretirement benefit plans of $16 million. During the remainder of 2026, we expect to make additional contributions of approximately $24 million to these plans.​

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