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Stockholders' Equity (Tables)
 3 Months Ended
Oct. 31, 2019
Equity [Abstract]  
Total share-based compensation expense
The following table summarizes the total share-based compensation expense that we recorded in operating income or loss for the periods shown.
 
Three Months Ended
(In millions)
October 31,
2019
 
October 31,
2018
Cost of revenue
$
15

 
$
14

Selling and marketing
30

 
30

Research and development
38

 
35

General and administrative
28

 
26

Total share-based compensation expense
$
111

 
$
105
Summary of share-based awards available for grant
A summary of share-based awards available for grant under our 2005 Equity Incentive Plan for the three months ended October 31, 2019 was as follows:
(Shares in thousands)
Shares
Available
for Grant
Balance at July 31, 2019
21,058

Options granted
—

Restricted stock units granted (1)
(524
)
Share-based awards canceled/forfeited/expired (1) (2)
1,313

Balance at October 31, 2019
21,847

(1)
RSUs granted from the pool of shares available for grant under our 2005 Equity Incentive Plan reduce the pool by 2.3 shares for each share granted. RSUs forfeited and returned to the pool of shares available for grant increase the pool by 2.3 shares for each share forfeited.
(2)
Stock options and RSUs canceled, expired or forfeited under our 2005 Equity Incentive Plan are returned to the pool of shares available for grant. Shares withheld for income taxes upon vesting of RSUs that were granted on or after July 21, 2016 are also returned to the pool of shares available for grant. Stock options and RSUs canceled, expired or forfeited under older expired plans are not returned to the pool of shares available for grant
Summary of restricted stock unit activity
A summary of restricted stock unit (RSU) activity for the three months ended October 31, 2019 was as follows:
 
Restricted Stock Units
(Shares in thousands)
Number
of Shares
 
Weighted
Average
Grant Date
Fair Value
Nonvested at July 31, 2019
5,683

 
$
186.22

Granted
228

 
270.18

Vested
(416
)
 
138.05

Forfeited
(334
)
 
112.51

Nonvested at October 31, 2019
5,161

 
$
198.57
Summary of stock option activity
A summary of stock option activity for the three months ended October 31, 2019 was as follows:
 
Options Outstanding
(Shares in thousands)
Number
of Shares
 
Weighted
Average
Exercise
Price
Per Share
Balance at July 31, 2019
3,374

 
$
150.75

Granted
—

 
—

Exercised
(231
)
 
118.40

Canceled or expired
(26
)
 
135.92

Balance at October 31, 2019
3,117

 
$
153.26

 
 
 
 
Exercisable at October 31, 2019
2,092

 
$
120.51