Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2020

Retirement Benefits [Abstract]

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

	Pension Benefits Cost
(Dollars in millions)	First Quarters
	2020			2019
Service Cost Included in Labor and Fringe	$	10		$	8
Interest Cost	20			26
Expected Return on Plan Assets	(43		)	(43		)
Amortization of Net Loss	14			7
Total Included in Other Income - Net	(9		)	(10		)
Net Periodic Benefit Cost/(Credit)	$	1		$	(2	)
	Other Post-retirement Benefits Cost
(Dollars in millions)	First Quarters
	2020			2019
Service Cost Included in Labor and Fringe	$	—		$	—
Interest Cost	1			1
Amortization of Prior Service Costs	(2		)	(2		)
Total Included in Other Income - Net	(1		)	(1		)
Net Periodic Benefit Credit	$	(1	)	$	(1	)