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Description of Business and Summary of Significant Accounting Policies - Schedule of shares used in the computation of basic and diluted net income per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Numerator:      
Net income $ 2,062 $ 1,826 $ 1,557
Shares used in basic per share amounts:      
Weighted average common shares outstanding (in shares) 270 261 260
Shares used in diluted per share amounts:      
Weighted average common shares outstanding (in shares) 270 261 260
Dilutive common equivalent shares from stock options and restricted stock awards (in shares) 3 3 4
Dilutive weighted average common shares outstanding (in shares) 273 264 264
Basic and diluted net income per share:      
Basic net income per share (in dollars per share) $ 7.65 $ 6.99 $ 5.99
Diluted net income per share (in dollars per share) $ 7.56 $ 6.92 $ 5.89
Weighted average stock options and restricted stock units that have been excluded from dilutive common equivalent shares outstanding due to their anti-dilutive effect (in shares) 0 0 1