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, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Amortization and deferrals:
Settlement loss	$ 1	$ 0	$ 4	$ 0
Post-Retirement Benefit Plans
Retirement and post-retirement benefit plans
Service cost	1	0	1	0
Interest cost	4	5	13	15
Expected return on plan assets	(7)	(8)	(19)	(24)
Amortization and deferrals:
Actuarial loss (gain)	(5)	(3)	(12)	(9)
Prior service benefit	(4)	(4)	(14)	(12)
Net periodic benefit (credit) cost	(11)	(10)	(31)	(30)
Settlement loss	0	0	0	0
Special termination benefits			0	9
Total periodic benefit (credit) cost	(11)	(10)	(31)	(21)
U.S.
Retirement and post-retirement benefit plans
Service cost			0	0
Interest cost			351	408
Expected return on plan assets			(507)	(549)
Amortization and deferrals:
Actuarial loss (gain)			55	42
Prior service benefit			0	0
Net periodic benefit (credit) cost			(101)	(99)
Settlement loss			3	1
Special termination benefits			0	0
Total periodic benefit (credit) cost			(98)	(98)
U.S. | Defined Benefit Plans
Retirement and post-retirement benefit plans
Service cost	0	0
Interest cost	117	136
Expected return on plan assets	(168)	(183)
Amortization and deferrals:
Actuarial loss (gain)	19	14
Prior service benefit	0	0
Net periodic benefit (credit) cost	(32)	(33)
Settlement loss	0	0
Total periodic benefit (credit) cost	(32)	(33)
Non-U.S.
Retirement and post-retirement benefit plans
Service cost			36	35
Interest cost			12	18
Expected return on plan assets			(24)	(36)
Amortization and deferrals:
Actuarial loss (gain)			30	18
Prior service benefit			(3)	(3)
Net periodic benefit (credit) cost			51	32
Settlement loss			1	1
Special termination benefits			0	0
Total periodic benefit (credit) cost			$ 52	$ 33
Non-U.S. | Defined Benefit Plans
Retirement and post-retirement benefit plans
Service cost	12	12
Interest cost	4	6
Expected return on plan assets	(8)	(12)
Amortization and deferrals:
Actuarial loss (gain)	10	6
Prior service benefit	(1)	(1)
Net periodic benefit (credit) cost	17	11
Settlement loss	1	0
Total periodic benefit (credit) cost	$ 18	$ 11