Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 700	$ 700	$ 800
Property under capital lease	173	203
Accumulated depreciation on property under capital lease	161	$ 186
Operating lease commitments, sublease rental income
2017	557
2018	464
2019	333
2020	257
2021	185
Thereafter	594
Less: Sublease rental income	(169)
Total	2,221
Unconditional purchase obligations	1,800
Unconditional purchase obligations details
2017	537
2018	529
2019	419
2020	175
2021	122
Thereafter	16
Total	$ 1,798