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Stock-Based Compensation (Tables)
 3 Months Ended
Jan. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Based Compensation Expense and the Resulting Tax Benefits from Continuing Operations
Stock-based compensation expense and the resulting tax benefits were as follows:
 
Three months ended January 31
 
2017
 
2016
 
In millions
Stock-based compensation expense
$
75

 
$
61

Income tax benefit
(24
)
 
(22
)
Stock-based compensation expense, net of tax
$
51

 
$
39
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 the fair value of restricted stock units subject to performance-adjusted vesting conditions in the Monte Carlo simulation model were as follows:
 
Three months ended January 31
 
2017
 
2016
Weighted-average fair value(1)
$
20

 
$
13

Expected volatility(2)
30.5
%
 
32.5
%
Risk-free interest rate(3)
1.4
%
 
1.2
%
Expected performance period in years(4)
2.9

 
2.9

_______________________________________________________________________________
(1) 
The weighted-average fair value was based on performance-adjusted restricted stock units granted during the period.
(2) 
The expected volatility was estimated using the historical volatility derived from HP’s common stock.
(3) 
The risk-free interest rate was estimated based on the yield on U.S. Treasury zero-coupon issues.
(4) 
The expected performance period was estimated based on the length of the remaining performance period from the grant date.
The weighted-average fair value and the assumptions used to measure fair value for the three months ended January 31, 2016 were as follows:
 
Three months ended January 31, 2016
Weighted-average fair value(1)
$
4

Expected volatility(2)
36.4
%
Risk-free interest rate(3)
1.9
%
Expected dividend yield(4)
3.4
%
Expected term in years(5)
6.0

_______________________________________________________________________________
(1) 
The weighted-average fair value was based on stock options granted during the period.
(2) 
The expected volatility was estimated using the leverage-adjusted average of the term-matching volatilities of peer companies due to the lack of volume of forward traded options, which precluded the use of implied volatility.
(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) 
Due to the lack of historical exercise and post-vesting termination patterns of the post-Separation employee base, the expected term was estimated using the simplified method; and for performance-contingent awards, the expected term represents an output from the lattice model.
Schedule of Restricted Stock Award Activity
A summary of restricted stock award activity was as follows:
 
Three months ended January 31, 2017
 
Shares
 
Weighted-Average
Grant Date Fair Value
Per Share
 
In thousands
 
 
Outstanding at beginning of period
28,710

 
$
13

Granted
13,476

 
$
16

Vested
(10,044
)
 
$
13

Forfeited
(224
)
 
$
14

Outstanding at end of period
31,918

 
$
14
Schedule of Stock Option Activity
A summary of stock option activity was as follows:
 
Three months ended January 31, 2017
 
Shares
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic Value
 
In thousands
 
 
 
In years
 
In millions
Outstanding at beginning of period
28,218

 
$
12

 
 
 
 

Granted
—

 
$
—

 
 
 
 

Exercised
(630
)
 
$
11

 
 
 
 

Forfeited and expired
(226
)
 
$
16

 
 
 
 

Outstanding at end of period
27,362

 
$
12

 
4.8
 
$
83

Vested and expected to vest at end of period
26,376

 
$
12

 
4.8
 
$
82

Exercisable at end of period
17,370

 
$
11

 
3.8
 
$
71