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Goodwill and Acquired Intangible Assets - Intangible Assets Acquired (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2021 | Jul. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 4,166 | $ 744
Accumulated amortization | (845) | (716)
Acquired intangible assets, net | $ 3,321 | $ 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 | (330) | (248)
Acquired intangible assets, net | $ 2,708 | $ 8
Weighted average life in years | 15 years | 5 years
Purchased Technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 686 | $ 421
Accumulated amortization | (439) | (404)
Acquired intangible assets, net | $ 247 | $ 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 | (35) | (25)
Acquired intangible assets, net | $ 365 | $ 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 | (41) | (39)
Acquired intangible assets, net | $ 1 | $ 3
Weighted average life in years | 3 years | 3 years

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