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Business Combinations - Pro Forma Financial Information (Details) - Credit Karma - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Business Acquisition [Line Items]    
Total revenue $ 9,876 $ 8,549
Net income $ 1,977 $ 1,319
Basic net income per share (in dollars per share) $ 7.21 $ 4.85
Diluted net income per share (in dollars per share) $ 7.11 $ 4.80