Goodwill and Intangible Assets (Details) $ in Millions	6 Months Ended
	Apr. 30, 2017 USD ($)
Goodwill
Balance at beginning of period	$ 24,178
Goodwill acquired during the period	1,323
Changes due to foreign currency	(1)
Goodwill adjustments	(2)
Balance at end of period	25,498
Enterprise Group
Goodwill
Balance at beginning of period	15,945
Goodwill acquired during the period	1,323
Changes due to foreign currency	(1)
Goodwill adjustments	(2)
Balance at end of period	17,265
Software
Goodwill
Balance at beginning of period	8,089
Goodwill acquired during the period	0
Changes due to foreign currency	0
Goodwill adjustments	0
Balance at end of period	8,089
Financial Services
Goodwill
Balance at beginning of period	144
Goodwill acquired during the period	0
Changes due to foreign currency	0
Goodwill adjustments	0
Balance at end of period	$ 144