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Note 12 - Employee Benefit Plans
 6 Months Ended
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.​