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Acquisitions and Dispositions (Details) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Jul. 02, 2025 USD ($) $ / shares	Jul. 31, 2026 USD ($)	Jul. 31, 2025 USD ($)	Jul. 31, 2026 USD ($)	Jul. 31, 2025 USD ($)	May 28, 2026 USD ($)	May 13, 2026 USD ($)	Nov. 28, 2025 USD ($) option	Nov. 17, 2025 USD ($) counterparty option
Business Combination [Line Items]
Payments for merger related costs		$ 69	$ 159	$ 300	$ 231
Juniper Networks, Inc
Business Combination [Line Items]
Business acquisition, share price (in USD per share) \| $ / shares	$ 40.00
Payments to acquire businesses, gross	$ 13,400
H3C
Business Combination [Line Items]
Put share purchase agreement, issued capital (as a percent)							0.138
H3C \| H3C \| UNIS
Business Combination [Line Items]
Equity method investment, put share purchase agreement, number of option rights \| option									3
Amended and Restated Put Share Purchase Agreement
Business Combination [Line Items]
Equity method investment, number of counterparties \| counterparty									5
Put share purchase agreement, issued capital (as a percent)									0.10
Put share purchase agreement									$ 714
Amended and Restated Put Share Purchase Agreement \| H3C
Business Combination [Line Items]
Put share purchase agreement, issued capital (as a percent)						0.052		0.09
Put share purchase agreement						$ 370	$ 987	$ 643
Gain on sale of equity method investment		$ 444		$ 444
Subsequent Option Agreement \| H3C \| H3C
Business Combination [Line Items]
Equity method investment, put share purchase agreement, number of share repurchase agreements \| option								3
Subsequent Option Agreement \| H3C \| H3C \| UNIS
Business Combination [Line Items]
Equity method investment, put share purchase agreement, number of share repurchase agreements \| option								1