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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 | Apr. 30, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total net revenue | $ 1,816 | $ 3,002 | $ 1,696 | $ 1,165 | $ 994 | $ 3,272 | $ 1,502 | $ 1,016 | $ 7,679 | $ 6,784 | $ 6,025
Cost of revenue | 322 | 426 | 340 | 290 | 281 | 354 | 285 | 247 |  |  |
All other costs and expenses | 1,011 | 1,163 | 1,086 | 865 | 866 | 1,134 | 984 | 779 |  |  |
Operating income | 483 | 1,413 | 270 | 10 | (153) | 1,784 | 233 | (10) | 2,176 | 1,854 | 1,560
Net income | $ 445 | $ 1,084 | $ 240 | $ 57 | $ (44) | $ 1,378 | $ 189 | $ 34 | $ 1,826 | $ 1,557 | $ 1,329
Basic net income (loss) per share (in dollars per share) | $ 1.70 | $ 4.15 | $ 0.92 | $ 0.22 | $ (0.17) | $ 5.30 | $ 0.73 | $ 0.13 | $ 6.99 | $ 5.99 | $ 5.18
Diluted net income (loss) per share (in dollars per share) | $ 1.68 | $ 4.11 | $ 0.91 | $ 0.22 | $ (0.17) | $ 5.22 | $ 0.72 | $ 0.13 | $ 6.92 | $ 5.89 | $ 5.09

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