Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2023

Retirement Benefits [Abstract]

Benefit or (Income) Cost Related to Pension and Postretirement Health Care and Life Insurance

The following table summarizes the components of net periodic benefit cost (income) related to our pension and postretirement health care and life insurance plans:

	(dollars in millions)
	Pension				Health Care and Life
Three Months Ended March 31,	2023		2022		2023		2022
Service cost - Cost of services	$	46	$	58	$	11	$	19
Service cost - Selling, general and administrative expense	7		8		2		4
Service cost	$	53	$	66	$	13	$	23
Amortization of prior service cost (credit)	$	28	$	15	$	(105)	$	(203)
Expected return on plan assets	(253)		(297)		(7)		(7)
Interest cost	188		110		136		83
Other components	$	(37)	$	(172)	$	24	$	(127)
Total	$	16	$	(106)	$	37	$	(104)