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Goodwill and Acquired Intangible Assets - Intangible Assets Acquired (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jul. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 4,161 |  | $ 744
Accumulated amortization | (777) |  | (716)
Acquired intangible assets, net | $ 3,384 |  | 28
Weighted average life in years | 14 years | 4 years |
Customer Lists / User Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 3,038 |  | 256
Accumulated amortization | (282) |  | (248)
Acquired intangible assets, net | $ 2,756 |  | 8
Weighted average life in years | 15 years | 5 years |
Purchased Technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 681 |  | 421
Accumulated amortization | (426) |  | (404)
Acquired intangible assets, net | $ 255 |  | 17
Weighted average life in years | 5 years | 3 years |
Trade Names and Logos |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 400 |  | 25
Accumulated amortization | (29) |  | (25)
Acquired intangible assets, net | $ 371 |  | 0
Weighted average life in years | 15 years | 0 years |
Covenants Not to Compete or Sue |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 42 |  | 42
Accumulated amortization | (40) |  | (39)
Acquired intangible assets, net | $ 2 |  | $ 3
Weighted average life in years | 3 years | 3 years |

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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 before 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 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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