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Retirement and Post-Retirement Benefit Plans (Tables)
 3 Months Ended
Jan. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Pension and Post-Retirement Benefit (Credit) Cost
The components of HP’s pension and post-retirement benefit (credit) cost recognized in the Consolidated Condensed Statements of Earnings were as follows:
 
Three months ended January 31
 
U.S. Defined Benefit Plans
 
Non-U.S. Defined Benefit Plans
 
Post-Retirement Benefit Plans
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
In millions
Service cost
$
—

 
$
—

 
$
16

 
$
14

 
$
—

 
$
—

Interest cost
103

 
123

 
5

 
6

 
3

 
4

Expected return on plan assets
(175
)
 
(145
)
 
(11
)
 
(10
)
 
(6
)
 
(5
)
Amortization and deferrals:
 

 
 

 
 

 
 

 
 

 
 

Actuarial loss (gain)
16

 
15

 
10

 
8

 
(2
)
 
(8
)
Prior service benefit
—

 
—

 
(1
)
 
(1
)
 
(3
)
 
(3
)
Net periodic (credit) benefit cost
(56
)
 
(7
)
 
19

 
17

 
(8
)
 
(12
)
Special termination benefit cost
—

 
—

 
—

 
—

 
44

 
—

Total periodic (credit) benefit cost
$
(56
)
 
$
(7
)
 
$
19

 
$
17

 
$
36

 
$
(12
)