Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Pension Benefit (Income) Expense and Post-retirement Benefit Expense

Net periodic benefit income for the Combined Pension Plan and the Lumen Pension Plan (together the "Pension Plans") includes the following components:

	Pension Plans
	Three Months Ended March 31,
	2022		2021
	(Dollars in millions)
Service cost	$	12	13
Interest cost	52		50
Expected return on plan assets	(100)		(138)
Recognition of prior service credit	(3)		(2)
Recognition of actuarial loss	37		49
Net periodic pension income	$	(2)	(28)

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

	Post-Retirement Benefit Plans
	Three Months Ended March 31,
	2022		2021
	(Dollars in millions)
Service cost	$	3	4
Interest cost	15		12
Recognition of prior service cost	2		4
Recognition of actuarial loss	—		1
Net periodic post-retirement benefit expense	$	20	21