Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2023

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The components of net periodic benefit cost are as follows:

dollars in millions	Three Months Ended March 31,
	2023		2022
Service cost	$	2	$	3
Interest cost	15		11
Expected return on assets	(21)		(22)
Amortization of prior service cost	—		—
Amortization of net actuarial loss	—		3
Net periodic benefit	$	(4)	$	(5)