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Retirement and Post-Retirement Benefit Plans (Tables)
 9 Months Ended
Jul. 31, 2018
Retirement Benefits [Abstract]  
Summary of Net Benefit Cost
The Company's net pension benefit cost for defined benefit plans recognized in the Condensed Consolidated Statements of Earnings for the three and nine months ended July 31, 2018 and 2017, was as follows:
 
Three months ended July 31,
 
Nine months ended July 31,
 
2018
 
2017
 
2018
 
2017
 
In millions
Service cost
$
26

 
$
36

 
$
79

 
$
106

Interest cost
55

 
53

 
168

 
155

Expected return on plan assets
(139
)
 
(137
)
 
(423
)
 
(401
)
Amortization and deferrals:
 

 
 

 
 
 
 

Actuarial loss
52

 
60

 
158

 
200

Prior service benefit
(4
)
 
(4
)
 
(12
)
 
(12
)
Net periodic benefit (credit) cost
(10
)
 
8

 
(30
)
 
48

Settlement loss
9

 
6

 
11

 
9

Special termination benefits
1

 
1

 
5

 
3

Plan expense allocation(1)
—

 
(1
)
 
—

 
(17
)
Net benefit (credit) cost from continuing operations
—

 
14

 
(14
)
 
43

Summary of net benefit (credit) cost:
 
 
 
 
 
 
 
Continuing operations
—

 
14

 
(14
)
 
43

Discontinued operations
—

 
3

 
—

 
83

Net benefit (credit) cost
$
—

 
$
17

 
$
(14
)
 
$
126

 
(1)
Plan expense allocation represents the net cost impact of employees of HPE covered under Everett or Seattle plans and employees of Everett or Seattle covered under HPE plans.