Goodwill and Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended					3 Months Ended
	Jan. 31, 2012	Jan. 31, 2012 Personal Systems Group	Oct. 31, 2011 Personal Systems Group	Jan. 31, 2012 Services	Oct. 31, 2011 Services	Jan. 31, 2012 Imaging and Printing Group	Jan. 31, 2012 Enterprise Servers, Storage and Networking	Jan. 31, 2012 Software	Jan. 31, 2012 HP Financial Services	Oct. 31, 2011 HP Financial Services	Jan. 31, 2012 Corporate Investments
Goodwill
Goodwill beginning balance	$ 44,551	$ 2,498	$ 2,498	$ 17,280	$ 17,280	$ 2,471	$ 8,070	$ 14,063	$ 144	$ 144	$ 25
Goodwill acquired during the period	12					12
Goodwill adjustments/reclassifications	76						(307)	398			(15)
Goodwill ending balance	44,639	2,498	2,498	17,280	17,280	2,483	7,763	14,461	144	144	10
Goodwill reclassification adjustment	280
Goodwill purchase accounting, adjustments to estimated fair values of purchased intangible assets and net tangible assets								224
Goodwill, currency translation adjustments								$ 106