v3.7.0.1

Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Oct. 31, 2016	May 31, 2016
Schedule of Equity Method Investments [Line Items]
Carrying value of investment in H3C	$ 2,620		$ 2,620		$ 2,648
Loss from equity interests	3	$ 0	25	$ 0
H3C
Schedule of Equity Method Investments [Line Items]
Carrying value of investment in H3C	$ 2,600		$ 2,600		$ 2,600
Ownership percentage	49.00%		49.00%		49.00%	49.00%
Loss from equity interests	$ 3		$ 25
Amortization of basis difference	38		73
Allocated portion	35		48
H3C | Unisplendour
Schedule of Equity Method Investments [Line Items]
Ownership percentage						51.00%
H3C | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Revenue	253		513
Purchases	66		157
Payable	$ 57		$ 57		$ 71

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