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Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Jul. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income | $ 1,914 | $ 1,413 | $ 2,098 | $ 1,693 |
Revenue recognized | 83 | 89 | $ 626 | 598 |
Description of timing |  |  | 12 months |  |
Long-term deferred revenue | 7 |  | $ 7 |  | $ 13
Notes receivable | 93 |  | 93 |  | $ 40
Segment Reconciling Items |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Expenses | 506 | 438 | 1,380 | 1,304 |
Segment Reconciling Items | Segment Reclass | Small Business & Self-Employed |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Expenses |  | 43 |  | 131 |
Segment Reconciling Items | Segment Reclass | Consumer |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Expenses |  | 29 |  | 82 |
Segment Reconciling Items | Segment Reclass | ProConnect |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Expenses |  | 3 |  | 10 |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income | 2,706 | 1,961 | 4,114 | 3,340 |
Operating Segments | Small Business & Self-Employed |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income | 620 | 456 | 1,979 | 1,496 |
Operating Segments | Consumer |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income | 1,773 | 1,350 | 1,622 | 1,521 |
Operating Segments | ProConnect |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income | $ 196 | 155 | $ 358 | 323 |
Operating Segments | Segment Reclass | Small Business & Self-Employed |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income |  | (43) |  | (131) |
Operating Segments | Segment Reclass | Consumer |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income |  | (29) |  | (82) |
Operating Segments | Segment Reclass | ProConnect |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income |  | $ (3) |  | $ (10) |

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