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Stockholders' Deficit (Tables)
 6 Months Ended
Apr. 30, 2020
Stockholders' Equity Note [Abstract]  
Schedule of Tax Effects Related to Other Comprehensive (Loss) Income
Tax effects related to Other Comprehensive Income (Loss)
 
Three months ended April 30
 
Six months ended April 30
 
2020
 
2019
 
2020
 
2019
 
In millions
Tax effect on change in unrealized components of cash flow hedges:
 
 
 

 
 
 
 

Tax provision on unrealized gains arising during the period
$
(33
)
 
$
(36
)
 
$
(49
)
 
$
(16
)
Tax provision (benefit) on losses (gains) reclassified into earnings
16

 
(2
)
 
26

 
20

 
(17
)
 
(38
)
 
(23
)
 
4

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

 
 

 
 

 
 

Tax benefit on losses arising during the period
—

 
1

 
—

 
1

Tax provision on amortization of actuarial loss and prior service benefit
(5
)
 
(3
)
 
(10
)
 
(6
)
Tax benefit on curtailments, settlements and other
—

 
—

 
—

 
1

 
(5
)
 
(2
)
 
(10
)
 
(4
)
Tax effect on change in cumulative translation adjustment
—

 
(2
)
 
—

 
(2
)
Tax provision on other comprehensive income (loss)
$
(22
)
 
$
(42
)
 
$
(33
)
 
$
(2
)
Schedule of Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes
Changes and reclassifications related to Other Comprehensive Income (Loss), net of taxes
 
Three months ended April 30
 
Six months ended April 30
 
2020
 
2019
 
2020
 
2019
 
In millions
Other comprehensive income (loss), net of taxes:
 

 
 

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

 
 

 
 
 
 
Unrealized losses arising during the period
$
(2
)
 
$
—

 
$
(1
)
 
$
—

Losses reclassified into earnings
—

 
3

 
—

 
3

 
(2
)
 
3

 
(1
)
 
3

Change in unrealized components of cash flow hedges:
 
 
 

 
 
 
 
Unrealized gains arising during the period
198

 
162

 
242

 
75

(Gains) losses reclassified into earnings
(37
)
 
4

 
(86
)
 
(153
)
 
161

 
166

 
156

 
(78
)
Change in unrealized components of defined benefit plans:
 

 
 

 
 
 
 
Losses arising during the period
(1
)
 
(3
)
 
(1
)
 
(3
)
Amortization of actuarial loss and prior service benefit(1)
16

 
9

 
31

 
17

Curtailments, settlements and other
1

 
1

 
1

 
—

 
16

 
7

 
31

 
14

Change in cumulative translation adjustment
(17
)
 
11

 
(11
)
 
6

Other comprehensive income (loss), net of taxes
$
158

 
$
187

 
$
175

 
$
(55
)
(1) 
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 AOCI, net of taxes and changes were as follows:
 
Six months ended April 30, 2020
 
Net unrealized
gains on
available-for-sale debt
securities
 
Net unrealized
gains (losses) on cash
flow hedges
 
Unrealized
components
of defined
benefit plans
 
Change in cumulative
translation
adjustment
 
Accumulated
other
comprehensive
loss
 
In millions
Balance at beginning of period
$
9

 
$
172

 
$
(1,410
)
 
$
4

 
$
(1,225
)
Other comprehensive income (loss) before reclassifications
(1
)
 
242

 
(1
)
 
(11
)
 
229

Reclassifications of (gains) losses into earnings
—

 
(86
)
 
31

 
—

 
(55
)
Reclassifications of settlements into earnings
—

 
—

 
1

 
—

 
1

Balance at end of period
$
8

 
$
328

 
$
(1,379
)
 
$
(7
)
 
$
(1,050
)