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Goodwill and Acquired Intangible Assets - Acquired Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 31, 2020 | Jul. 31, 2019
Finite-Lived Intangible Assets [Abstract] |  |
Cost | $ 744 | $ 742
Accumulated amortization | (716) | (688)
Acquired intangible assets, net | $ 28 | $ 54
Weighted average life in years | 4 years | 4 years
Expected Future Amortization Expense |  |
2021 | $ 17 |
2022 | 10 |
2023 | 1 |
2024 | 0 |
2025 | 0 |
Thereafter | 0 |
Acquired intangible assets, net | 28 | $ 54
Customer Lists |  |
Finite-Lived Intangible Assets [Abstract] |  |
Cost | 256 | 256
Accumulated amortization | (248) | (245)
Acquired intangible assets, net | $ 8 | $ 11
Weighted average life in years | 5 years | 5 years
Expected Future Amortization Expense |  |
Acquired intangible assets, net | $ 8 | $ 11
Purchased Technology |  |
Finite-Lived Intangible Assets [Abstract] |  |
Cost | 421 | 422
Accumulated amortization | (404) | (383)
Acquired intangible assets, net | $ 17 | $ 39
Weighted average life in years | 3 years | 3 years
Expected Future Amortization Expense |  |
Acquired intangible assets, net | $ 17 | $ 39
Trade Names and Logos |  |
Finite-Lived Intangible Assets [Abstract] |  |
Cost | 25 | 25
Accumulated amortization | (25) | (24)
Acquired intangible assets, net | 0 | $ 1
Weighted average life in years |  | 3 years
Expected Future Amortization Expense |  |
Acquired intangible assets, net | 0 | $ 1
Covenants Not to Compete or Sue |  |
Finite-Lived Intangible Assets [Abstract] |  |
Cost | 42 | 39
Accumulated amortization | (39) | (36)
Acquired intangible assets, net | $ 3 | $ 3
Weighted average life in years | 3 years | 3 years
Expected Future Amortization Expense |  |
Acquired intangible assets, net | $ 3 | $ 3

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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