Postretirement Benefits - Schedule of Net Benefit (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Net postretirement benefits expense	$ 160	$ 177	$ 203
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	12	20	17
Interest on obligations	158	143	169
Amortization of cumulative loss	(94)	(128)	(112)
Amortization of cumulative loss	0	1	1
Curtailments	0	(4)	(5)
Contractual termination benefits	23	0	2
Retrospective payments to retirees	0	0	0
Premiums on pension insurance	12	9	8
Expected return on assets	193	189	192
Net postretirement benefits expense	106	116	122
Actuarial net loss (gain)	(164)	422	(469)
Amortization of cumulative loss	(94)	(128)	(112)
Prior service cost (benefit)	0	(1)	(1)
Amortization of prior service benefit (cost)	0	1	1
Curtailments	0	33	0
Currency translation	(1)	0	(2)
Total recognized in other comprehensive loss (income)	71	(585)	357
Total net postretirement benefits expense and other comprehensive loss (income)	(177)	469	(479)
Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	7	7
Interest on obligations	68	62	83
Amortization of cumulative loss	(16)	(29)	(38)
Amortization of cumulative loss	(4)	(4)	(5)
Curtailments	0	0	3
Contractual termination benefits	2	0	(2)
Retrospective payments to retirees	0	0	(2)
Premiums on pension insurance	0	0	0
Expected return on assets	33	33	35
Net postretirement benefits expense	54	61	81
Actuarial net loss (gain)	(326)	175	58
Amortization of cumulative loss	(16)	(29)	(38)
Prior service cost (benefit)	0	0	0
Amortization of prior service benefit (cost)	(4)	(4)	(5)
Curtailments	0	0	(3)
Currency translation	0	0	0
Total recognized in other comprehensive loss (income)	314	(200)	(88)
Total net postretirement benefits expense and other comprehensive loss (income)	$ (368)	$ 139	$ 7