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Equity Method Investments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investments in equity interests	$ 2,210	$ 2,170
Earnings (loss) from equity interests	180	67	$ 20
Impairment of equity method investments	0	0
Equity Method Investee | H3C
Schedule of Equity Method Investments [Line Items]
Sales to related party	794	737	897
Purchases from related party	150	215	202
Payable to H3C	32	29
Receivables due from H3C	70	19
H3C
Schedule of Equity Method Investments [Line Items]
Investments in equity interests	$ 2,200	$ 2,200
Ownership	49.00%	49.00%
Cash dividend	$ 184	$ 165
Basis difference	2,534
Earnings (loss) from equity interests	$ 180	$ 67	$ 20
Weighted-average useful life	5 years

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