Employee Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
Service cost	$	2	$	3	$	3	$	5
Non-service (benefit) costs:
Interest cost	3		2		6		5
Expected return on plan assets	(5)		(5)		(10)		(11)
Amortization of actuarial loss and prior service cost	(1)		—		(2)		—
Other	—		—		(5)		—
Total non-service benefit	(3)		(3)		(11)		(6)
Net periodic benefit	$	(1)	$	—	$	(8)	$	(1)