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Employee Benefits (Tables)
12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of cost allocation of service costs The combined net pension and post-retirement service costs is included in cost of services and products and selling, general and administrative expenses on our consolidated statement of operations, in the amounts for the respective periods presented in the table below:
Years Ended December 31,
20242023
2022

(Dollars in millions)
Allocated pension service costs$20 22 31 
Allocated post-retirement service costs
% of Lumen's total pension and post-retirement service costs86 %87 %72 %