Employee Benefits (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2025		2024
	(Dollars in millions)
Service cost	$	5	6
Interest cost	60		63
Expected return on plan assets	(63)		(67)
Recognition of prior service credit	—		(2)
Recognition of actuarial loss	35		28
Net periodic pension expense	$	37	28

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

	Post-Retirement Benefit Plans
	Three Months Ended March 31,
	2025		2024
	(Dollars in millions)
Service cost	$	1	1
Interest cost	22		23
Recognition of prior service credit	(2)		(2)
Recognition of actuarial gain	(6)		(4)
Net periodic post-retirement benefit expense	$	15	18