Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Service cost	$	3	$	4	$	5	$	7
Interest cost	15		11		30		22
Expected return on assets	(22)		(22)		(43)		(44)
Amortization of prior service cost	—		—		—		—
Amortization of net actuarial loss	—		3		—		6
Net periodic benefit	$	(4)	$	(4)	$	(8)	$	(9)