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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
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 March 31,
2019

 
2018

 
2019

 
2018

Service cost - Cost of services
$
50

 
$
58

 
$
20

 
$
26

Service cost - Selling, general and administrative expense
11

 
14

 
4

 
6

Service cost
$
61

 
$
72

 
$
24

 
$
32

 
 
 
 
 
 
 
 
Amortization of prior service cost (credit)
$
15

 
$
10

 
$
(243
)
 
$
(244
)
Expected return on plan assets
(282
)
 
(329
)
 
(9
)
 
(11
)
Interest cost
178

 
166

 
157

 
153

Remeasurement gain, net
(96
)
 
—

 
—

 
—

Other components
$
(185
)
 
$
(153
)
 
$
(95
)
 
$
(102
)
 
 
 
 
 
 
 
 
Total
$
(124
)
 
$
(81
)
 
$
(71
)
 
$
(70
)