Consolidated Statements of Cash Flows (Parenthetical)	3 Months Ended	12 Months Ended
	Oct. 31, 2017 USD ($)	Oct. 31, 2017 USD ($)
Face amount of debt instrument	$ 0	$ 0
Spinoff
Pension funding payments		1,900,000,000
HPE | Everett SpinCo, Inc. | Spinoff
Due to HPE		3,000,000,000
HPE | Seattle SpinCo, Inc. | Spinoff
Due to HPE	2,500,000,000
Term loan facility | HPE | Everett SpinCo, Inc.
Face amount of debt instrument	3,500,000,000.0	3,500,000,000.0
Term loan facility | HPE | Seattle SpinCo, Inc.
Face amount of debt instrument	$ 2,600,000,000.0	$ 2,600,000,000.0