Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Benefit or (Income) Cost Related to Pension and Postretirement Health Care and Life Insurance

The following table summarizes the components of net periodic benefit cost (income) related to our pension and postretirement health care and life insurance plans:

	(dollars in millions)
	Pension						Health Care and Life
Three Months Ended June 30,	2018			2017			2018			2017
Service cost - Cost of services	$	59		$	55		$	26		$	29
Service cost - Selling, general and administrative expense	14			15			6			8
Service cost	$	73		$	70		$	32		$	37
Amortization of prior service cost (credit)	$	10		$	9		$	(244	)	$	(235	)
Expected return on plan assets	(329		)	(316		)	(11		)	(13		)
Interest cost	166			171			154			165
Other components	$	(153	)	$	(136	)	$	(101	)	$	(83	)
Total	$	(80	)	$	(66	)	$	(69	)	$	(46	)

	(dollars in millions)
	Pension						Health Care and Life
Six Months Ended June 30,	2018			2017			2018			2017
Service cost - Cost of services	$	117		$	110		$	52		$	58
Service cost - Selling, general and administrative expense	28			30			12			16
Service cost	$	145		$	140		$	64		$	74
Amortization of prior service cost (credit)	$	20		$	19		$	(488	)	$	(470	)
Expected return on plan assets	(658		)	(632		)	(22		)	(26		)
Interest cost	332			342			307			330
Other components	$	(306	)	$	(271	)	$	(203	)	$	(166	)
Total	$	(161	)	$	(131	)	$	(139	)	$	(92	)