Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Numerator:
Net earnings	$ 2,844	$ 3,152	$ 5,327
Denominator:
Weighted-average shares used to compute basic net EPS (in shares)	1,413	1,515	1,615
Dilutive effect of employee stock plans (in shares)	7	9	19
Weighted-average shares used to compute diluted net EPS (in shares)	1,420	1,524	1,634
Net earnings per share:
Basic (in dollars per share)	$ 2.01	$ 2.08	$ 3.30
Diluted (in dollars per share)	$ 2.00	$ 2.07	$ 3.26
Anti dilutive weighted-average stock-based compensation awards (in shares)	13	7	0