Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

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

	Pension Benefits
(Dollars in millions)	First Quarters
	2019			2018
Service Cost Included in Labor and Fringe	$	8		$	9
Interest Cost	26			23
Expected Return on Plan Assets	(43		)	(44		)
Amortization of Net Loss	7			10
Total Income Included in Other Income - Net	(10		)	(11		)
Net Periodic Benefit Credit	$	(2	)	$	(2	)
	Other Post-retirement Benefits
(Dollars in millions)	First Quarters
	2019			2018
Service Cost Included in Labor and Fringe	$	—		$	—
Interest Cost	1			2
Amortization of Prior Service Costs	(2		)	—
Total (Income) Expense Included in Other Income - Net	(1		)	2
Net Periodic Benefit (Credit) Cost	$	(1	)	$	2