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Stockholders' Equity - Stock-Option Activity and Related Share-Based Compensation Expense (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Oct. 31, 2021
USD ($)
$ / shares
shares
Number of Shares  
Options granted, number of shares (in shares) 0
Employee Stock Option  
Number of Shares  
Options outstanding, beginning balance (in shares) 2,204
Options granted, number of shares (in shares) 0
Options exercised, number of shares (in shares) (58)
Options canceled or expired, number of shares (in shares) 0
Options outstanding, ending balance (in shares) 2,146
Weighted Average Exercise Price Per Share  
Weighted average exercise price per share, beginning balance (in dollars per share) | $ / shares $ 251.48
Options granted, weighted average exercise price per share (in dollars per share) | $ / shares 0
Options exercised, weighted average exercise price per share (in dollars per share) | $ / shares 210.92
Options canceled or expired, weighted average exercise price per share (in dollars per share) | $ / shares 0
Weighted average exercise price per share, ending balance (in dollars per share) | $ / shares $ 252.58
Exercisable (in shares) 1,364
Exercisable, weighted average exercise price per share (in dollars per share) | $ / shares $ 176.81
Unrecognized compensation cost related to non-vested share based compensation expense | $ $ 68
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years 3 years 1 month 6 days