Retirement and Post-Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Oct. 31, 2015
Defined benefit plans
Recognized expenses (credits)	$ 38	$ 16	$ 108	$ 68
Amortization and deferrals:
Settlements	0	178	0	178
Former Parent Company | Multiemployer pension plans
Defined benefit plans
Recognized expenses (credits)	(15)		(15)
U.S. Defined Benefit Plans
Net benefit (credit) cost
Service cost	0	0	0	0
Interest cost	0	4	0	12
Expected return on plan assets	0	0	0	0
Amortization and deferrals:
Actuarial loss (gain)	0	1	0	2
Prior service benefit	0	0	0	0
Net periodic benefit cost	0	5	0	14
Settlement loss	0	0	0	0
Special termination benefits	0	0	0	0
Net benefit cost	0	5	0	14
Non-U.S. Defined Benefit Plans
Net benefit (credit) cost
Service cost	64	18	192	54
Interest cost	137	63	414	191
Expected return on plan assets	(244)	(97)	(738)	(294)
Amortization and deferrals:
Actuarial loss (gain)	79	34	235	103
Prior service benefit	(6)	(1)	(18)	(1)
Net periodic benefit cost	30	17	85	53
Settlement loss	1	0	2	1
Special termination benefits	6	9	17	15
Net benefit cost	37	26	104	69
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans					$ 366
Contributions to benefit plans			293
Expected additional contribution to benefit plans as a result of impact of foreign currency			55
U.S. non-qualified plan participants
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans					1
Expected additional contribution to benefit plans as a result of impact of foreign currency			1
Post-Retirement Benefit Plans
Net benefit (credit) cost
Service cost	1	0	3	0
Interest cost	2	0	6	0
Expected return on plan assets	(1)	0	(2)	0
Amortization and deferrals:
Actuarial loss (gain)	(1)	0	(3)	0
Prior service benefit	0	0	0	0
Net periodic benefit cost	1	0	4	0
Settlement loss	0	0	0	0
Special termination benefits	0	0	0	0
Net benefit cost	$ 1	$ 0	4	$ 0
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans			2		$ 3
Expected additional contribution to benefit plans as a result of impact of foreign currency			$ 1