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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
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,
2020

 
2019

 
2020

 
2019

Service cost - Cost of services
$
59

 
$
50

 
$
22

 
$
20

Service cost - Selling, general and administrative expense
14

 
11

 
5

 
4

Service cost
$
73

 
$
61

 
$
27

 
$
24

 
 
 
 
 
 
 
 
Amortization of prior service cost (credit)
$
15

 
$
15

 
$
(241
)
 
$
(243
)
Expected return on plan assets
(297
)
 
(282
)
 
(7
)
 
(9
)
Interest cost
140

 
178

 
107

 
157

Remeasurement loss (gain), net
182

 
(96
)
 
—

 
—

Other components
$
40

 
$
(185
)
 
$
(141
)
 
$
(95
)
 
 
 
 
 
 
 
 
Total
$
113

 
$
(124
)
 
$
(114
)
 
$
(71
)