Retirement and Post-Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Oct. 31, 2017	Oct. 31, 2015	Oct. 31, 2015
Defined Benefit Plans
Defined benefit plans
Plan assets	$ 8,300
Projected benefit obligation	8,100
Recognized accumulated comprehensive loss	$ 1,900
Post-Retirement Benefit Plans
Defined benefit plans
Recognized credits			$ 27
Post-retirement benefit plan obligation transferred from Parent		$ 150	150
Post-retirement benefit plan asset transferred from Parent		40	40
Recognized accumulated other comprehensive income transferred from parent		10	10
Non-U.S. Plans | Defined Benefit Plans
Defined benefit plans
Plan assets		11,700	11,700
Projected benefit obligation		11,900
Recognized accumulated comprehensive loss		$ 2,600	$ 2,600