Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Goodwill
Balance at beginning of period	$ 27,261	$ 25,960
Goodwill acquired during the period	12	1,987
Goodwill, divested during the period	(3,324)	(123)
Changes due to foreign currency	(31)	(57)
Goodwill adjustments	260	(506)
Balance at end of period	24,178	27,261
Accumulated impairment losses			$ 13,700
Enterprise Group
Goodwill
Balance at beginning of period	18,712	16,867
Goodwill acquired during the period	2	1,891
Goodwill, divested during the period	(3,000)	0
Changes due to foreign currency	(29)	(52)
Goodwill adjustments	260	6
Balance at end of period	15,945	18,712
Enterprise Services
Goodwill
Balance at beginning of period	92	97
Goodwill acquired during the period	0	0
Goodwill, divested during the period	(90)	0
Changes due to foreign currency	(2)	(5)
Goodwill adjustments	0	0
Balance at end of period	0	92
Accumulated impairment losses			8,000
Software
Goodwill
Balance at beginning of period	8,313	8,852
Goodwill acquired during the period	10	96
Goodwill, divested during the period	(234)	(123)
Changes due to foreign currency	0	0
Goodwill adjustments	0	(512)
Balance at end of period	8,089	8,313
Accumulated impairment losses			$ 5,700
Financial Services
Goodwill
Balance at beginning of period	144	144
Goodwill acquired during the period	0	0
Goodwill, divested during the period	0	0
Changes due to foreign currency	0	0
Goodwill adjustments	0	0
Balance at end of period	$ 144	$ 144