Goodwill and Purchased Intangible Assets - Schedule of Goodwill by Reportable Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 26, 2025	Jul. 27, 2024
Goodwill [Roll Forward]
Beginning balance	$ 58,660	$ 38,535
Acquisitions, net of Divestitures	191
Foreign Currency Translation and Other	285	(93)
Ending balance	59,136	58,660
Splunk
Goodwill [Roll Forward]
Acquisitions, net of Divestitures		19,301
Acquisitions
Goodwill [Roll Forward]
Acquisitions, net of Divestitures		917
Americas
Goodwill [Roll Forward]
Beginning balance	36,169	24,035
Acquisitions, net of Divestitures	121
Foreign Currency Translation and Other	178	(58)
Ending balance	36,468	36,169
Americas | Splunk
Goodwill [Roll Forward]
Acquisitions, net of Divestitures		11,619
Americas | Acquisitions
Goodwill [Roll Forward]
Acquisitions, net of Divestitures		573
EMEA
Goodwill [Roll Forward]
Beginning balance	14,283	9,118
Acquisitions, net of Divestitures	47
Foreign Currency Translation and Other	67	(22)
Ending balance	14,397	14,283
EMEA | Splunk
Goodwill [Roll Forward]
Acquisitions, net of Divestitures		4,980
EMEA | Acquisitions
Goodwill [Roll Forward]
Acquisitions, net of Divestitures		207
APJC
Goodwill [Roll Forward]
Beginning balance	8,208	5,382
Acquisitions, net of Divestitures	23
Foreign Currency Translation and Other	40	(13)
Ending balance	$ 8,271	8,208
APJC | Splunk
Goodwill [Roll Forward]
Acquisitions, net of Divestitures		2,702
APJC | Acquisitions
Goodwill [Roll Forward]
Acquisitions, net of Divestitures		$ 137