Retirement and Post-Retirement Benefit Plans (Details 3) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Nov. 01, 2014	Jul. 31, 2015	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
U.S. Defined Benefit Plans
Net benefit (credit) cost
Service cost			$ 1	$ 1	$ 1
Interest cost			566	569	560
Expected return on plan assets			(818)	(811)	(845)
Amortization and deferrals:
Actuarial (gain) loss			54	15	77
Net periodic benefit (credit) cost			(197)	(226)	(207)
Settlement loss			114	1	12
Net benefit cost (credit)			(83)	(225)	(195)
Employer Contributions and Funding Policy
Contributions to benefit plans			$ 29	27
Percentage of eligible participants who elected to receive benefits			50.00%
Lump sum payments to participants		$ 826
Re-measurement resulting in additional benefit cost			$ 45
Settlement Expense			96
Non-U.S. Defined Benefit Plans
Net benefit (credit) cost
Service cost			326	308	337
Interest cost			622	737	676
Expected return on plan assets			(1,166)	(1,140)	(1,007)
Amortization and deferrals:
Actuarial (gain) loss			441	318	341
Prior service benefit			(21)	(23)	(27)
Net periodic benefit (credit) cost			202	200	320
Curtailment gain				(7)	(3)
Settlement loss			4	12	18
Special termination benefits			25	50	31
Net benefit cost (credit)			231	255	366
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2016	$ 18		384
Contributions to benefit plans			619	1,019
U.S. non-qualified plan participants
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2016	36		37
Post-Retirement Benefit Plans
Net benefit (credit) cost
Service cost			5	5	6
Interest cost			29	32	31
Expected return on plan assets			(39)	(34)	(34)
Amortization and deferrals:
Actuarial (gain) loss			(11)	(10)	2
Prior service benefit			(20)	(41)	(67)
Net periodic benefit (credit) cost			(36)	(48)	(62)
Curtailment gain					(7)
Special termination benefits			1	32	(5)
Net benefit cost (credit)			$ (35)	(16)	$ (74)
Age for eligibility under HP Retirement Medical Savings Account Plan			45 years
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2016	$ 43		$ 46
Contributions to benefit plans			$ 39	$ 92