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Stockholders' Deficit (Tables)
 3 Months Ended
Jan. 31, 2020
Stockholders' Equity Note [Abstract]  
Schedule of Tax Effects Related to Other Comprehensive (Loss) Income
Tax effects related to Other Comprehensive Loss
 
Three months ended January 31
 
2020
 
2019
 
In millions
Tax effect on change in unrealized components of available-for-sale debt securities:
 

 
 

Tax benefit on unrealized losses arising during the period
$
—

 
$
—

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

Tax (provision) benefit on unrealized losses arising during the period
(16
)
 
20

Tax provision on gains reclassified into earnings
10

 
22

 
(6
)
 
42

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

 
 

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

 
1

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

 
—

Tax (provision) benefit on other comprehensive loss
$
(11
)
 
$
40
Schedule of Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes
Changes and reclassifications related to Other Comprehensive Loss, net of taxes
 
Three months ended January 31
 
2020
 
2019
 
In millions
Other comprehensive loss, net of taxes:
 

 
 

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

 
 

Unrealized gains arising during the period
$
1

 
$
—

 
 
 
 
Change in unrealized components of cash flow hedges:
 
 
 

Unrealized gain (losses) arising during the period
44

 
(87
)
Gains reclassified into earnings
(49
)
 
(157
)
 
(5
)
 
(244
)
Change in unrealized components of defined benefit plans:
 

 
 

Amortization of actuarial loss and prior service benefit(1)
15

 
8

Curtailments, settlements and other
—

 
(1
)
 
15

 
7

Change in cumulative translation adjustment
6

 
(5
)
Other comprehensive gain (loss), net of taxes
$
17

 
$
(242
)
(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 accumulated other comprehensive loss, net of taxes and changes were as follows:
 
Three months ended January 31, 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 gain before reclassifications
1

 
44

 
—

 
6

 
51

Reclassifications of (gain) loss into earnings
—

 
(49
)
 
15

 
—

 
(34
)
Balance at end of period
$
10

 
$
167

 
$
(1,395
)
 
$
10

 
$
(1,208
)