Segment Information (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Segment Reporting Information
Net revenue	$ 26,839	$ 28,154
Operating segments
Segment Reporting Information
Net revenue	27,751	28,984
Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(912)	(830)
Enterprise Group
Segment Reporting Information
Net revenue	6,680	6,791
Enterprise Group | Operating segments
Segment Reporting Information
Net revenue	6,981	6,970
Enterprise Group | Operating segments | Industry Standard Servers
Segment Reporting Information
Net revenue	3,387	3,178
Enterprise Group | Operating segments | Technology Services
Segment Reporting Information
Net revenue	1,987	2,100
Enterprise Group | Operating segments | Storage
Segment Reporting Information
Net revenue	837	834
Enterprise Group | Operating segments | Networking
Segment Reporting Information
Net revenue	562	630
Enterprise Group | Operating segments | Business Critical Systems
Segment Reporting Information
Net revenue	208	228
Enterprise Group | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(301)	(179)
Enterprise Services
Segment Reporting Information
Net revenue	4,780	5,283
Enterprise Services | Operating segments
Segment Reporting Information
Net revenue	4,993	5,595
Enterprise Services | Operating segments | Infrastructure Technology Outsourcing
Segment Reporting Information
Net revenue	3,132	3,501
Enterprise Services | Operating segments | Application and Business Services
Segment Reporting Information
Net revenue	1,861	2,094
Enterprise Services | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(213)	(312)
Software
Segment Reporting Information
Net revenue	811	846
Software | Operating segments
Segment Reporting Information
Net revenue	871	916
Software | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(60)	(70)
HP Financial Services
Segment Reporting Information
Net revenue	781	854
HP Financial Services | Operating segments
Segment Reporting Information
Net revenue	803	870
HP Financial Services | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(22)	(16)
Corporate Investments
Segment Reporting Information
Net revenue	16	288
Corporate Investments | Operating segments
Segment Reporting Information
Net revenue	16	288
Printing and Personal Systems Group | Operating segments
Segment Reporting Information
Net revenue	14,087	14,345
Printing and Personal Systems Group | Personal Systems
Segment Reporting Information
Net revenue	8,286	8,310
Printing and Personal Systems Group | Personal Systems | Operating segments
Segment Reporting Information
Net revenue	8,544	8,530
Printing and Personal Systems Group | Personal Systems | Operating segments | Notebooks
Segment Reporting Information
Net revenue	4,724	4,335
Printing and Personal Systems Group | Personal Systems | Operating segments | Desktops
Segment Reporting Information
Net revenue	2,949	3,274
Printing and Personal Systems Group | Personal Systems | Operating segments | Workstations
Segment Reporting Information
Net revenue	526	533
Printing and Personal Systems Group | Personal Systems | Operating segments | Other
Segment Reporting Information
Net revenue	345	388
Printing and Personal Systems Group | Personal Systems | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(258)	(220)
Printing and Personal Systems Group | Printing
Segment Reporting Information
Net revenue	5,485	5,782
Printing and Personal Systems Group | Printing | Operating segments
Segment Reporting Information
Net revenue	5,543	5,815
Printing and Personal Systems Group | Printing | Operating segments | Supplies
Segment Reporting Information
Net revenue	3,601	3,795
Printing and Personal Systems Group | Printing | Operating segments | Commercial Hardware
Segment Reporting Information
Net revenue	1,316	1,347
Printing and Personal Systems Group | Printing | Operating segments | Consumer Hardware
Segment Reporting Information
Net revenue	626	673
Printing and Personal Systems Group | Printing | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	$ (58)	$ (33)