Retirement and Post-Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Oct. 31, 2013
U.S. Defined Benefit Plans
Net benefit costs
Service cost		$ 1		$ 1
Interest cost	142	140	426	420
Expected return on plan assets	(203)	(211)	(608)	(634)
Amortization and deferrals:
Actuarial loss (gain)	4	19	12	58
Net periodic benefit (credit) cost	(57)	(51)	(170)	(155)
Settlement loss	1	1	1	9
Net benefit (credit) cost	(56)	(50)	(169)	(146)
Non-U.S. Defined Benefit Plans
Net benefit costs
Service cost	78	83	233	253
Interest cost	187	166	555	507
Expected return on plan assets	(290)	(247)	(858)	(754)
Amortization and deferrals:
Actuarial loss (gain)	81	82	239	254
Prior service benefit	(6)	(7)	(18)	(20)
Net periodic benefit (credit) cost	50	77	151	240
Curtailment gain			(5)
Settlement loss	2	11	4	11
Special termination benefits	5	7	33	12
Net benefit (credit) cost	57	95	183	263
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2014					617
Contributions to benefit plans			450
Expected contribution to benefit plans as of balance sheet date			158
U.S. non-qualified plan participants
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2014					33
Contributions to benefit plans			20
Expected contribution to benefit plans as of balance sheet date			13
Post-Retirement Benefit Plans
Net benefit costs
Service cost	1	2	3	5
Interest cost	8	8	24	23
Expected return on plan assets	(9)	(8)	(26)	(25)
Amortization and deferrals:
Actuarial loss (gain)	(2)		(7)
Prior service benefit	(10)	(16)	(30)	(50)
Net periodic benefit (credit) cost	(12)	(14)	(36)	(47)
Curtailment gain				(7)
Special termination benefits			(11)
Net benefit (credit) cost	(12)	(14)	(47)	(54)
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2014					109
Contributions to benefit plans			73
Expected contribution to benefit plans as of balance sheet date			$ 36