Retirement and Post-Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Oct. 31, 2015
U.S. Defined Benefit Plans
Net benefit (credit) cost
Interest cost	$ 136	$ 139
Expected return on plan assets	(183)	(217)
Amortization and deferrals:
Actuarial loss (gain)	14	13
Net periodic benefit (credit) cost	(33)	(65)
Settlement loss	1
Total periodic benefit (credit) cost from continuing operations	(32)	(65)
Discontinued operations		4
Total periodic benefit (credit) cost	(32)	(61)
Non-U.S. Defined Benefit Plans
Net benefit (credit) cost
Service cost	12	68
Interest cost	6	99
Expected return on plan assets	(12)	(207)
Amortization and deferrals:
Actuarial loss (gain)	6	78
Prior service benefit	(1)	(5)
Net periodic benefit (credit) cost	11	33
Special termination benefits		1
Plan (credit) expense allocation		(4)
Total periodic benefit (credit) cost from continuing operations	11	30
Discontinued operations		27
Total periodic benefit (credit) cost	11	57
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2016			$ 18
Contributions to benefit plans	3
U.S. non-qualified plan participants
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2016			36
Contributions to benefit plans	8
Post-Retirement Benefit Plans
Net benefit (credit) cost
Service cost		1
Interest cost	5	7
Expected return on plan assets	(8)	(9)
Amortization and deferrals:
Actuarial loss (gain)	(3)	(3)
Prior service benefit	(4)	(5)
Net periodic benefit (credit) cost	(10)	(9)
Plan (credit) expense allocation		8
Total periodic benefit (credit) cost from continuing operations	(10)	(1)
Discontinued operations		(8)
Total periodic benefit (credit) cost	(10)	$ (9)
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2016			$ 43
Contributions to benefit plans	$ 8