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Stockholders' Deficit (Tables)
 9 Months Ended
Jul. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Tax Effects Related to Other Comprehensive (Loss) Income
Tax effects related to Other Comprehensive (Loss) Income
 
Three months ended July 31
 
Nine months ended July 31
 
2017
 
2016
 
2017
 
2016
 
In millions
Tax effects on change in unrealized gains on available-for-sale securities:
 

 
 

 
 

 
 

Tax provision on gains arising during the period
$
—

 
$
—

 
$
(1
)
 
$
—

 
—

 
—

 
(1
)

—

Tax effects on change in unrealized components of cash flow hedges:
 
 
 

 
 

 
 

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

 
(5
)
 
70

 
46

Tax (benefit) provision on losses (gains) reclassified into earnings
(2
)
 
(20
)
 
9

 
3

 
61

 
(25
)
 
79

 
49

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

 
 

 
 

 
 

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

 
—

 
(4
)
 
2

Tax provision on amortization of actuarial loss and prior service benefit
(5
)
 
(3
)
 
(16
)
 
(9
)
Tax benefit (provision) on settlements and other
1

 
—

 
(8
)
 
(1
)
 
(4
)
 
(3
)
 
(28
)
 
(8
)
Tax benefit (provision) on other comprehensive (loss) income
$
57

 
$
(28
)
 
$
50


$
41
Schedule of Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
 
Three months ended July 31
 
Nine months ended July 31
 
2017
 
2016
 
2017
 
2016
 
In millions
Other comprehensive (loss) income, net of taxes:
 

 
 

 
 

 
 

Change in unrealized gains on available-for-sale securities:
 

 
 

 
 

 
 

Gains arising during the period
$
1

 
$
1

 
$
4

 
$
2

 
1

 
1

 
4

 
2

Change in unrealized components of cash flow hedges:
 
 
 

 
 

 
 

(Losses) gains arising during the period
(456
)
 
170

 
(688
)
 
181

Gains (losses) reclassified into earnings(1)
36

 
139

 
(40
)
 
66

 
(420
)
 
309

 
(728
)
 
247

Change in unrealized components of defined benefit plans:
 

 
 

 
 

 
 

Gains (losses) arising during the period
—

 
—

 
9

 
(2
)
Amortization of actuarial loss and prior service benefit(2)
14

 
9

 
40

 
27

Settlements and other
1

 
—

 
(5
)
 
—

 
15

 
9

 
44

 
25

Other comprehensive (loss) income, net of taxes
$
(404
)
 
$
319

 
$
(680
)
 
$
274

(1) 
Reclassification of pre-tax 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
 
2017
 
2016
 
2017
 
2016
 
In millions
Net revenue
$
26

 
$
140

 
$
(89
)
 
$
(26
)
Cost of revenue
13

 
18

 
32

 
90

Operating expenses
(1
)
 
(1
)
 
(1
)
 
(1
)
Interest and other, net
—

 
2

 
9

 
—

Total
$
38

 
$
159

 
$
(49
)
 
$
63


(2) 
These components are included in the computation of net pension and post-retirement benefit (credit) 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, 2017
 
Net unrealized
gains on
available-for-sale
securities
 
Net unrealized
gains (losses) on cash
flow hedges
 
Unrealized
components
of defined
benefit plans
 
Accumulated
other
comprehensive
loss
 
In millions
Balance at beginning of period
$
9

 
$
186

 
$
(1,633
)
 
$
(1,438
)
Other comprehensive income (loss) before reclassifications
4

 
(688
)
 
4

 
(680
)
Reclassifications of (income) loss into earnings
—

 
(40
)
 
40

 
—

Balance at end of period
$
13

 
$
(542
)
 
$
(1,589
)
 
$
(2,118
)