Retirement and Post-Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2015	Oct. 31, 2014
Shared plans
Defined benefit plans
Shared plan contribution		$ 518	$ 277
Non-U.S. 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
Defined benefit plan accumulated other comprehensive loss on transfer	553
Post-Retirement Benefit Plans
Defined benefit plans
Recognized credits		28	$ 18
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