Net Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Numerator:
Earnings from continuing operations	$ 248	$ 2,457	$ 16	$ 3,141
Loss from discontinued operations	(83)	(185)	(196)	(282)
Net earnings (loss)	$ 165	$ 2,272	$ (180)	$ 2,859
Denominator:
Weighted-average shares used to compute basic net EPS (in shares)	1,641	1,681	1,656	1,722
Dilutive effect of employee stock plans (in shares)	26	34	27	26
Weighted-average shares used to compute diluted net EPS (in shares)	1,667	1,715	1,683	1,748
Basic net earnings (loss) per share:
Continuing operations (in dollars per share)	$ 0.15	$ 1.46	$ 0.01	$ 1.82
Discontinued operations (in dollars per share)	(0.05)	(0.11)	(0.12)	(0.16)
Total basic net earnings (loss) per share (in dollars per share)	0.10	1.35	(0.11)	1.66
Diluted net earnings (loss) per share:
Diluted - Continuing operations (in dollars per share)	0.15	1.43	0.01	1.80
Diluted - Discontinued operations (in dollars per share)	(0.05)	(0.11)	(0.12)	(0.16)
Total diluted net earnings (loss) per share (in dollars per share)	$ 0.10	$ 1.32	$ (0.11)	$ 1.64
Anti-dilutive weighted-average stock awards (in shares)	16	25	8	44