Employee Retirement Benefits (Tables)

9 Months Ended

Sep. 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 September 30,				Nine months ended September 30,
	2023		2022		2023		2022
Service cost	$	1	$	2	$	4	$	7
Non-service (benefit) costs:
Interest cost	3		3		9		8
Expected return on plan assets	(5)		(6)		(15)		(17)
Amortization of actuarial loss and prior service cost	—		—		(2)		—
Other	—		—		(5)		—
Total non-service benefit	(2)		(3)		(13)		(9)
Net periodic benefit	$	(1)	$	(1)	$	(9)	$	(2)