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Stockholders' Deficit (Tables)
 9 Months Ended
Jul. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Tax Effects Related to Other Comprehensive Income (Loss)
Tax effects related to Other Comprehensive Income (Loss)
 
Three months ended July 31
 
Nine months ended July 31
 
2018
 
2017
 
2018
 
2017
 
In millions
Tax effect on change in unrealized components of available-for-sale securities:
 

 
 

 
 

 
 

Tax benefit (provision) on unrealized (losses) gains arising during the period
$
—

 
$
—

 
$
1

 
$
(1
)
 
—

 
—

 
1

 
(1
)
Tax effect on change in unrealized components of cash flow hedges:
 
 
 

 
 
 
 

Tax (provision) benefit on unrealized gains (losses) arising during the period
(26
)
 
63

 
7

 
70

Tax (benefit) provision on losses (gains) reclassified into earnings
(2
)
 
(2
)
 
(34
)
 
9

 
(28
)
 
61

 
(27
)
 
79

Tax effect on change in unrealized components of defined benefit plans:
 

 
 

 
 

 
 

Tax provision on gains arising during the period
(1
)
 
—

 
(1
)
 
(4
)
Tax provision on amortization of actuarial loss and prior service benefit
(2
)
 
(5
)
 
(8
)
 
(16
)
Tax benefit (provision) on curtailments, settlements and other
—

 
1

 
—

 
(8
)
 
(3
)
 
(4
)
 
(9
)
 
(28
)
Tax (provision) benefit on other comprehensive income
$
(31
)
 
$
57

 
$
(35
)
 
$
50
Schedule of Changes and Reclassifications Related to Other Comprehensive Income (Loss), Net of Taxes
Changes and reclassifications related to Other Comprehensive Income (Loss), net of taxes
 
Three months ended July 31
 
Nine months ended July 31
 
2018
 
2017
 
2018
 
2017
 
In millions
Other comprehensive income (loss), net of taxes:
 

 
 

 
 

 
 

Change in unrealized components of available-for-sale securities:
 

 
 

 
 

 
 

Unrealized gains (losses) arising during the period
$
2

 
$
1

 
$
(2
)
 
$
4

Gains reclassified into earnings
—

 
—

 
(5
)
 
—

 
2

 
1

 
(7
)
 
4

Change in unrealized components of cash flow hedges:
 
 
 

 
 
 
 

Unrealized gains (losses) arising during the period
247

 
(456
)
 
26

 
(688
)
Losses (gains) reclassified into earnings(1)
15

 
36

 
329

 
(40
)
 
262

 
(420
)
 
355

 
(728
)
Change in unrealized components of defined benefit plans:
 

 
 

 
 

 
 

Gains arising during the period
1

 
—

 
1

 
9

Amortization of actuarial loss and prior service benefit(2)
9

 
14

 
28

 
40

Curtailments, settlements and other
1

 
1

 
2

 
(5
)
 
11

 
15

 
31

 
44

Other comprehensive income (loss), net of taxes
$
275

 
$
(404
)
 
$
379

 
$
(680
)
(1) 
Reclassification of pre-tax losses (gains) on cash flow hedges into the Consolidated Condensed Statements of Earnings was as follows:
 
Three months ended July 31
 
Nine months ended July 31
 
2018
 
2017
 
2018
 
2017
 
In millions
Net revenue
$
20

 
$
26

 
$
349

 
$
(89
)
Cost of revenue
(4
)
 
13

 
14

 
32

Operating expenses
1

 
(1
)
 
—

 
(1
)
Interest and other, net
—

 
—

 
—

 
9

Total
$
17

 
$
38

 
$
363

 
$
(49
)

(2) 
These components are included in the computation of net pension and post-retirement (credit) benefit charges in Note 4, “Retirement and Post-Retirement Benefit Plans.”
Schedule of Accumulated Other Comprehensive Loss, Net of Taxes
The components of accumulated other comprehensive loss, net of taxes and changes were as follows:
 
Nine months ended July 31, 2018
 
Net unrealized
gains on
available-for-sale
securities
 
Net unrealized
(losses) gains on cash
flow hedges
 
Unrealized
components
of defined
benefit plans
 
Accumulated
other
comprehensive
loss
 
In millions
Balance at beginning of period
$
12

 
$
(240
)
 
$
(1,190
)
 
$
(1,418
)
Other comprehensive (loss) income before reclassifications
(2
)
 
26

 
1

 
25

Reclassifications of (gains) losses into earnings
(5
)
 
329

 
28

 
352

Reclassifications of curtailments, settlements and other into earnings
—

 
—

 
2

 
2

Balance at end of period
$
5

 
$
115

 
$
(1,159
)
 
$
(1,039
)