Stockholders' Equity - Share-based compensation expense (Details) - USD ($) $ in Millions	12 Months Ended
Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 2,056	$ 1,968	$ 1,940
Income tax benefit	(366)	(548)	(594)
Decrease in net income	1,690	1,420	1,346
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold \| Service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	370	420	398
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold \| Product and other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1	3	4
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	392	375	368
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	706	629	639
Location, Statement of Income, Balance [Axis]: us-gaap:RestructuringCharges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	0	0	25
Location, Statement of Income, Balance [Axis]: us-gaap:SellingAndMarketingExpense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 587	$ 541	$ 506

Amount, after tax, of expense for award under share-based payment arrangement.

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