Employee Retirement Benefits (Tables)

9 Months Ended

Sep. 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 September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Service cost	$	2	$	2	$	7	$	6
Non-service costs (benefit):
Interest cost	3		4		9		10
Expected return on plan assets	(5)		(5)		(16)		(15)
Amortization of actuarial loss and prior service cost	—		—		2		1
Other	—		—		—		1
Total non-service benefit	(2)		(1)		(5)		(3)
Net periodic benefit cost	$	—	$	1	$	2	$	3