Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Schedule of Components of Expense/(Income) Related to Net Benefit Expense

	Pension Benefits Cost
	Third Quarters				Nine Months
(Dollars in millions)	2020		2019		2020		2019
Service Cost Included in Labor and Fringe	$	10	$	8	$	30	$	24
Interest Cost	20		25		61		77
Expected Return on Plan Assets	(43)		(43)		(130)		(129)
Amortization of Net Loss	15		8		43		23
Total Included in Other Income - Net	(8)		(10)		(26)		(29)
Net Periodic Benefit Cost/(Credit)	$	2	$	(2)	$	4	$	(5)
	Other Post-retirement Benefits Cost
	Third Quarters				Nine Months
(Dollars in millions)	2020		2019		2020		2019
Service Cost Included in Labor and Fringe	$	—	$	—	$	1	$	1
Interest Cost	1		—		2		2
Amortization of Prior Service Costs	(2)		(2)		(5)		(5)
Total Included in Other Income - Net	(1)		(2)		(3)		(3)
Net Periodic Benefit Cost/(Credit)	$	(1)	$	(2)	$	(2)	$	(2)