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Employee Benefits (Tables)
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
202420232024
2023
 (Dollars in millions)
Service cost$6 7 18 19 
Interest cost63 67 188 202 
Expected return on plan assets(68)(72)(204)(215)
Recognition of prior service credit(3)(2)(6)(5)
Recognition of actuarial loss28 27 82 78 
Net periodic pension expense$26 27 78 79 


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

 Post-Retirement Benefit Plans
 Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
 (Dollars in millions)
Service cost$1 1 3 4 
Interest cost23 26 70 77 
Recognition of prior service credit(1)(2)(5)(6)
Recognition of actuarial gain(4)(5)(13)(15)
Special termination benefits charge— — 2 — 
Net periodic post-retirement benefit expense$19 20 57 60