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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2024
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,
202420232024
2023
 (Dollars in millions)
Service cost$6 6 12 12 
Interest cost62 67 125 135 
Expected return on plan assets(69)(72)(136)(143)
Recognition of prior service credit(1)(1)(3)(3)
Recognition of actuarial loss26 26 54 51 
Net periodic pension expense$24 26 52 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,
 2024202320242023
 (Dollars in millions)
Service cost$1 2 2 3 
Interest cost24 25 47 51 
Recognition of prior service credit(2)(2)(4)(4)
Recognition of actuarial gain(5)(5)(9)(10)
Special termination benefits charge2 — 2 — 
Net periodic post-retirement benefit expense$20 20 38 40