Net Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Numerator:
Net earnings (loss)	$ 9	$ (27)	$ (479)	$ 569
Denominator:
Weighted-average shares used to compute basic net EPS (in shares)	1,292	1,334	1,294	1,367
Dilutive effect of employee stock plans (in shares)	8	0	0	13
Weighted-average shares used to compute diluted net EPS (in shares)	1,300	1,334	1,294	1,380
Net earnings (loss) per share:
Basic (in dollars per share)	$ 0.01	$ (0.02)	$ (0.37)	$ 0.42
Diluted (in dollars per share)	$ 0.01	$ (0.02)	$ (0.37)	$ 0.41
Anti-dilutive weighted-average stock awards (in shares)	21	44	48	4