Net Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Numerator:
Net earnings (loss) from continuing operations	$ 850	$ (478)	$ 2,332	$ (227)
Net loss from discontinued operations	(72)	(134)	(118)	(118)
Net earnings (loss)	$ 778	$ (612)	$ 2,214	$ (345)
Denominator:
Weighted-average shares used to compute basic net EPS (in shares)	1,552	1,658	1,571	1,664
Dilutive effect of employee stock plans (in shares)	30	0	30	0
Weighted-average shares used to compute diluted net EPS (in shares)	1,582	1,658	1,601	1,664
Basic net earnings (loss) per share:
Continuing operations (in dollars per share)	$ 0.55	$ (0.29)	$ 1.48	$ (0.14)
Discontinued operations (in dollars per share)	(0.05)	(0.08)	(0.07)	(0.07)
Total basic net earnings (loss) per share (in dollars per share)	0.50	(0.37)	1.41	(0.21)
Diluted net earnings (loss) per share:
Diluted - Continuing operations (in dollars per share)	0.54	(0.29)	1.46	(0.14)
Diluted - Discontinued operations (in dollars per share)	(0.05)	(0.08)	(0.08)	(0.07)
Total diluted net earnings (loss) per share (in dollars per share)	$ 0.49	$ (0.37)	$ 1.38	$ (0.21)
Anti-dilutive weighted-average stock awards (in shares)	1	85	3	90