Postretirement Benefits - Schedule of Net Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Net postretirement benefits expense	$ 150	$ 160	$ 177
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	13	12	20
Interest on obligations	142	158	143
Amortization of cumulative loss	97	94	128
Amortization of cumulative loss	1	0	1
Curtailments	0	0	4
Contractual termination benefits	(1)	23	0
Premiums on pension insurance	11	12	9
Expected return on assets	(194)	(193)	(189)
Net postretirement benefits expense	69	106	116
Actuarial net loss (gain)	312	164	(422)
Amortization of cumulative loss	(97)	(94)	(128)
Prior service cost (benefit)	0	0	(1)
Amortization of prior service benefit	(1)	0	(1)
Curtailments	0	0	(33)
Currency translation	0	1	0
Total recognized in other comprehensive loss (income)	214	71	(585)
Total net postretirement benefits expense and other comprehensive loss (income)	283	177	(469)
Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	7
Interest on obligations	71	68	62
Amortization of cumulative loss	39	16	29
Amortization of cumulative loss	(4)	(4)	(4)
Curtailments	0	0	0
Contractual termination benefits	(1)	2	0
Premiums on pension insurance	0	0	0
Expected return on assets	(30)	(33)	(33)
Net postretirement benefits expense	81	54	61
Actuarial net loss (gain)	(7)	326	(175)
Amortization of cumulative loss	(39)	(16)	(29)
Prior service cost (benefit)	0	0	0
Amortization of prior service benefit	4	4	4
Curtailments	0	0	0
Currency translation	0	0	0
Total recognized in other comprehensive loss (income)	(42)	314	(200)
Total net postretirement benefits expense and other comprehensive loss (income)	$ 39	$ 368	$ (139)