Employee Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

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

(Dollars in millions)	Three months ended June 30,				Six months ended June 30,
	2020		2019		2020		2019
Service cost	$	3	$	2	$	5	$	4
Non-service costs (benefit):
Interest cost	3		3		6		6
Expected return on plan assets	(6)		(5)		(11)		(10)
Amortization of actuarial loss and prior service cost	1		1		2		1
Other	—		—		—		1
Total non-service benefit	(2)		(1)		(3)		(2)
Net periodic benefit cost	$	1	$	1	$	2	$	2