v3.26.1
Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Pension Benefit Expense and Post-retirement Benefit Expense
Net periodic benefit expense for the Lumen Combined Pension Plan (the "Combined Pension Plan" or the "Plan") includes the following components:

Combined Pension Plan
 Three Months Ended March 31,
20262025
 (Dollars in millions)
Service cost$4 5 
Interest cost51 60 
Expected return on plan assets(64)(63)
Settlement charges9 — 
Curtailment loss5 — 
Recognition of actuarial loss28 35 
Net periodic pension expense$33 37 

Net periodic benefit expense for our post-retirement benefit plan includes the following components:

 
Post-Retirement Benefit Plan
 Three Months Ended March 31,
 20262025
 (Dollars in millions)
Service cost$1 1 
Interest cost19 22 
Recognition of prior service credit(1)(2)
Recognition of actuarial gain(7)(6)
Curtailment gain(10)— 
Net periodic post-retirement benefit expense$2 15