Employee Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2023

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The following summarizes the components of net periodic benefit for our qualified and supplemental pension plans:

(Dollars in millions)	Three months ended March 31,
	2023		2022
Service cost	$	1	$	2
Non-service (benefit) costs:
Interest cost	3		3
Expected return on plan assets	(5)		(6)
Amortization of actuarial loss and prior service cost	(1)		—
Other	(5)		—
Total non-service benefit	(8)		(3)
Net periodic benefit	$	(7)	$	(1)