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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2025
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 June 30,Six Months Ended June 30,
202520242025
2024
 (Dollars in millions)
Service cost$6 6 11 12 
Interest cost60 62 120 125 
Expected return on plan assets(64)(69)(127)(136)
Recognition of prior service credit(1)(1)(1)(3)
Recognition of actuarial loss37 26 72 54 
Net periodic pension expense$38 24 75 52 


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

 Post-Retirement Benefit Plans
 Three Months Ended June 30,Six Months Ended June 30,
 2025202420252024
 (Dollars in millions)
Service cost$1 1 2 2 
Interest cost22 24 44 47 
Recognition of prior service credit(1)(2)(3)(4)
Recognition of actuarial gain(7)(5)(13)(9)
Special termination benefits charge— 2 — 2 
Net periodic post-retirement benefit expense$15 20 30 38