Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s retirement plans were:

	Three Months Ended June 30,												Six Months Ended June 30,
	Pension Plans						Postretirement Welfare Plan						Pension Plans						Postretirement Welfare Plan
(Dollars in Millions)	2017			2016			2017			2016			2017			2016			2017			2016
Service cost	$	46		$	44		$	–		$	–		$	93		$	88		$	–		$	–
Interest cost		55			53			1			1			110			105			2			2
Expected return on plan assets		(71	)		(66	)		–			–			(142	)		(132	)		(1	)		–
Prior service cost (credit) amortization		–			(1	)		(1	)		(1	)		(1	)		(2	)		(2	)		(2	)
Actuarial loss (gain) amortization		32			43			(2	)		(1	)		64			87			(3	)		(2	)
Net periodic benefit cost	$	62		$	73		$	(2	)	$	(1	)	$	124		$	146		$	(4	)	$	(2	)