Acquired Intangible Assets - Intangible Assets Acquired (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2021	Jul. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 4,178	$ 4,166
Accumulated amortization	(983)	(914)
Acquired intangible assets, net	$ 3,195	$ 3,252
Weighted average life in years	14 years	14 years
Customer Lists / User Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 3,038	$ 3,038
Accumulated amortization	(424)	(377)
Acquired intangible assets, net	$ 2,614	$ 2,661
Weighted average life in years	15 years	15 years
Purchased Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 698	$ 686
Accumulated amortization	(470)	(455)
Acquired intangible assets, net	$ 228	$ 231
Weighted average life in years	5 years	5 years
Trade Names and Logos
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 400	$ 400
Accumulated amortization	(48)	(41)
Acquired intangible assets, net	$ 352	$ 359
Weighted average life in years	15 years	15 years
Covenants Not to Compete or Sue
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 42	$ 42
Accumulated amortization	(41)	(41)
Acquired intangible assets, net	$ 1	$ 1
Weighted average life in years	3 years	3 years