Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

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

The following table describes the components of expense / (income) related to net benefit expense recorded in labor and fringe on the income statement.

	Pension Benefits
(Dollars in millions)	Third Quarters						Nine Months
	2017			2016			2017			2016
Service Cost	$	8		$	12		$	28		$	36
Interest Cost	23			29			69			89
Expected Return on Plan Assets	(43		)	(39		)	(128		)	(118		)
Amortization of Net Loss	10			12			31			36
Net Periodic Benefit Cost	$	(2	)	$	14		$	—		$	43
Special Termination Benefits - Management Workforce Reduction/Curtailment	—			—			57			—
Total Expense	$	(2	)	$	14		$	57		$	43
	Other Post-retirement Benefits
(Dollars in millions)	Third Quarters						Nine Months
	2017			2016			2017			2016
Service Cost	$	—		$	—		$	1		$	1
Interest Cost	2			3			6			9
Amortization of Net Loss	—			1			—			2
Net Periodic Benefit Cost	$	2		$	4		$	7		$	12
Special Termination Benefits - Management Workforce Reduction/Curtailment	—			—			13			—
Total Expense	$	2		$	4		$	20		$	12