Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

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

	Pension Benefits Cost
	Third Quarters				Nine Months
(Dollars in millions)	2021		2020		2021		2020
Service Cost Included in Labor and Fringe	$	10	$	10	$	28	$	30
Interest Cost	13		20		40		61
Expected Return on Plan Assets	(46)		(43)		(139)		(130)
Amortization of Net Loss	18		15		55		43
Total Included in Other Income - Net	(15)		(8)		(44)		(26)
Net Periodic Benefit (Credit)/Cost	$	(5)	$	2	$	(16)	$	4
	Other Post-retirement Benefits Cost
	Third Quarters				Nine Months
(Dollars in millions)	2021		2020		2021		2020
Service Cost Included in Labor and Fringe	$	1	$	—	$	1	$	1
Interest Cost	—		1		1		2
Amortization of Prior Service Credits	(2)		(2)		(6)		(5)
Total Included in Other Income - Net	(2)		(1)		(5)		(3)
Net Periodic Benefit Credit	$	(1)	$	(1)	$	(4)	$	(2)