Employee Benefits (Tables)

6 Months Ended

Jun. 30, 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 June 30,			Six Months Ended June 30,
	2022		2021	2022	2021
	(Dollars in millions)
Service cost	$	11	15	23	28
Interest cost	50		49	102	99
Expected return on plan assets	(102)		(138)	(202)	(276)
Recognition of prior service credit	(2)		(3)	(5)	(5)
Recognition of actuarial loss	30		49	67	98
Net periodic pension income	$	(13)	(28)	(15)	(56)

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,
	2022		2021	2022	2021
	(Dollars in millions)
Service cost	$	2	3	5	7
Interest cost	15		11	30	23
Recognition of prior service cost	2		4	4	8
Recognition of actuarial loss	—		1	—	2
Net periodic post-retirement benefit expense	$	19	19	39	40