Retirement and Post-Retirement Benefit Plans - Schedule of Pension and Post-Retirement Benefit (Credit) Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Post-Retirement Benefit Plans
Retirement and post-retirement benefit plans
Service cost	$ 0	$ 1	$ 0	$ 1
Interest cost	4	4	12	13
Expected return on plan assets	(6)	(7)	(18)	(19)
Amortization and deferrals:
Actuarial loss (gain)	(4)	(5)	(12)	(12)
Prior service benefit	(5)	(4)	(15)	(14)
Net periodic (credit) benefit cost	(11)	(11)	(33)	(31)
Settlement loss	0	0	0	0
Total periodic benefit (credit) cost	(11)	(11)	(33)	(31)
U.S. | Defined Benefit Plans
Retirement and post-retirement benefit plans
Service cost	0	0	0	0
Interest cost	113	117	339	351
Expected return on plan assets	(180)	(168)	(540)	(507)
Amortization and deferrals:
Actuarial loss (gain)	14	19	45	55
Prior service benefit	0	0	0	0
Net periodic (credit) benefit cost	(53)	(32)	(156)	(101)
Settlement loss	1	0	2	3
Total periodic benefit (credit) cost	(52)	(32)	(154)	(98)
Non-U.S. | Defined Benefit Plans
Retirement and post-retirement benefit plans
Service cost	14	12	42	36
Interest cost	6	4	18	12
Expected return on plan assets	(10)	(8)	(30)	(24)
Amortization and deferrals:
Actuarial loss (gain)	7	10	21	30
Prior service benefit	(1)	(1)	(3)	(3)
Net periodic (credit) benefit cost	16	17	48	51
Settlement loss	0	1	0	1
Total periodic benefit (credit) cost	$ 16	$ 18	$ 48	$ 52