Net Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Numerator:
(Loss) earnings from continuing operations	$ (487)	$ 322	$ (232)	$ 684
(Loss) earnings from discontinued operations	(125)	(2)	(113)	(97)
Net (loss) earnings	$ (612)	$ 320	$ (345)	$ 587
Denominator:
Weighted-average shares used to compute basic net EPS (in shares)	1,658	1,725	1,664	1,743
Dilutive effect of employee stock plans (in shares)	0	26	0	22
Weighted-average shares used to compute diluted net EPS (in shares)	1,658	1,751	1,664	1,765
Basic net (loss) earnings per share:
Basic - Continuing operations (in dollars per share)	$ (0.29)	$ 0.19	$ (0.14)	$ 0.39
Basic - Discontinued operations (in dollars per share)	(0.08)	0.00	(0.07)	(0.06)
Total basic net (loss) earnings per share (in dollars per share)	(0.37)	0.19	(0.21)	0.33
Diluted - Continuing operations (in dollars per share)	(0.29)	0.18	(0.14)	0.39
Diluted - Discontinued operations (in dollars per share)	(0.08)	0.00	(0.07)	(0.06)
Total diluted net (loss) earnings per share (in dollars per share)	$ (0.37)	$ 0.18	$ (0.21)	$ 0.33
Anti-dilutive weighted average stock awards (in shares)	85	46	90	51