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Stock-Based Compensation (Tables)
 9 Months Ended
Jul. 31, 2016
Share-based compensation  
Schedule of stock based compensation expense and the resulting tax benefits
Stock-based compensation expense and the resulting tax benefits were as follows:
 
Three Months Ended
July 31,
 
Nine Months Ended
July 31,
 
2016
 
2015
 
2016
 
2015
 
In millions
Stock-based compensation expense
$
149

 
$
117

 
$
452

 
$
353

Income tax benefit
(45
)
 
(38
)
 
(134
)
 
(116
)
Stock-based compensation expense, net of tax
$
104

 
$
79

 
$
318

 
$
237
Schedule of restricted stock award activity
A summary of restricted stock award activity is as follows:
 
Nine Months Ended
July 31, 2016
 
Shares
 
Weighted-Average Grant Date Fair Value Per Share
 
In thousands
 
 
Outstanding at beginning of period
—

 
$
—

Converted from former Parent's plan
42,012

 
$
15

Granted(1)
31,956

 
$
15

Vested
(9,637
)
 
$
15

Forfeited
(3,560
)
 
$
15

Outstanding at end of period
60,771

 
$
15

______________________________________________________________________________
(1)
Includes a one-time restricted stock unit retention grant of approximately 5 million shares.
Stock Options  
Share-based compensation  
Schedule of weighted-average fair value and the assumptions used to measure fair value
The weighted-average fair value and the assumptions used to measure fair value were as follows:
 
Three Months Ended
July 31, 2016
 
Nine Months Ended
July 31, 2016
Weighted-average fair value(1)
$
5

 
$
4

Expected volatility(2)
28.4
%
 
31.1
%
Risk-free interest rate(3)
1.2
%
 
1.7
%
Expected dividend yield(4)
1.2
%
 
1.5
%
Expected term in years(5)
5.3

 
5.4

______________________________________________________________________________
(1)
The weighted-average fair value was based on the fair value of stock options granted during the period.
(2)
The expected volatility was estimated using the average historical volatility of selected peer companies.
(3)
The risk-free interest rate was estimated based on the yield on U.S. Treasury zero-coupon issues.
(4)
The expected dividend yield represents a constant dividend yield applied for the duration of the expected term of the award.
(5)
For awards subject to service-based vesting, the expected term was estimated using the simplified method detailed in SEC Staff Accounting Bulletin No. 107 and for performance-contingent awards, the expected term represents an output from the lattice model.
Schedule of stock option activity
A summary of stock option activity is as follows:
 
Nine months ended July 31, 2016
 
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
 
In thousands
 
 
 
In years
 
In millions
Outstanding at beginning of period
—

 
$
—

 
 
 
 

Converted from former Parent's plan
42,579

 
$
15

 
 
 
 

Granted(1)
25,369

 
$
15

 
 
 
 

Exercised
(4,861
)
 
$
10

 
 
 
 

Forfeited/canceled/expired
(1,780
)
 
$
20

 
 
 
 

Outstanding at end of period
61,307

 
$
15

 
5.7
 
$
381

Vested and expected to vest at end of period
59,118

 
$
15

 
5.7
 
$
369

Exercisable at end of period
25,373

 
$
14

 
4.1
 
$
194

______________________________________________________________________________
(1)
Includes one-time stock option retention grant of approximately 16 million shares.