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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Employee-related Liabilities [Abstract]  
Components of Net Periodic Benefit Cost
The Company's net periodic benefit cost includes the following components for the three months ended June 30 (in millions):
 
 
Pension Benefits
 
Other Postretirement Benefits
 
Affected Line Item
in the Statements of
Consolidated Operations
 
 
2018
 
2017
 
2018
 
2017
 
 
Service cost
 
$
57

 
$
49

 
$
3

 
$
4

 
Salaries and related costs
Interest cost
 
54

 
55

 
15

 
17

 
Miscellaneous, net
Expected return on plan assets
 
(73
)
 
(61
)
 
—

 
(1
)
 
Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)
 
32

 
32

 
(18
)
 
(18
)
 
Miscellaneous, net
Settlement loss
 
—

 
1

 
—

 
—

 
Miscellaneous, net
Total
 
$
70

 
$
76

 
$
—

 
$
2

 
 
The Company's net periodic benefit cost includes the following components for the six months ended June 30 (in millions):
 
 
Pension Benefits
 
Other Postretirement Benefits
 
Affected Line Item
in the Statements of
Consolidated Operations
 
 
2018
 
2017
 
2018
 
2017
 
 
Service cost
 
$
114

 
$
98

 
$
6

 
$
6

 
Salaries and related costs
Interest cost
 
108

 
110

 
30

 
34

 
Miscellaneous, net
Expected return on plan assets
 
(146
)
 
(121
)
 
—

 
(1
)
 
Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)
 
65

 
63

 
(35
)
 
(36
)
 
Miscellaneous, net
Settlement loss
 
—

 
2

 
—

 
—

 
Miscellaneous, net
Total
 
$
141

 
$
152

 
$
1

 
$
3

 
 
Share-Based Compensation Expense
The table below presents information related to share-based compensation (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Share-based compensation expense
$
27

 
$
33

 
$
44

 
$
56

 
 
 
 
 
 
 
 
 
 
 
June 30, 2018
 
December 31, 2017
 
 
 
 
Unrecognized share-based compensation
$
86

 
$
53