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Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Jul. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income (loss) | $ (25) | $ 270 | $ 184 | $ 280 |
Revenue recognized | 144 | 154 | $ 543 | 509 |
Description of timing |  |  | 12 months |  |
Long-term deferred revenue | 7 |  | $ 7 |  | $ 13
Notes receivable | 62 |  | 62 |  | $ 40
Segment Reconciling Items |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Expenses | 442 | 440 | 874 | 866 |
Segment Reconciling Items | Segment Reclass | Small Business & Self-Employed |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Expenses |  | 45 |  | 88 |
Segment Reconciling Items | Segment Reclass | Consumer |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Expenses |  | 28 |  | 53 |
Segment Reconciling Items | Segment Reclass | ProConnect |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Expenses |  | 4 |  | 7 |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income (loss) | 647 | 824 | 1,408 | 1,379 |
Operating Segments | Small Business & Self-Employed |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income (loss) | 592 | 447 | 1,359 | 1,040 |
Operating Segments | Consumer |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income (loss) | (155) | 191 | (151) | 171 |
Operating Segments | ProConnect |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income (loss) | $ 172 | 186 | $ 162 | 168 |
Operating Segments | Segment Reclass | Small Business & Self-Employed |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income (loss) |  | 45 |  | 88 |
Operating Segments | Segment Reclass | Consumer |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income (loss) |  | 28 |  | 53 |
Operating Segments | Segment Reclass | ProConnect |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating income (loss) |  | $ 4 |  | $ 7 |

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