Net Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Numerator:
Earnings from continuing operations	$ (772)	$ 452	$ 850	$ 1,482	$ 378	$ 285	$ (478)	$ 251	$ 2,012	$ 436	$ 3,237
Net (loss) earnings from discontinued operations	$ 15	$ (1)	$ (72)	$ (46)	$ 146	$ (120)	$ (134)	$ 16	(104)	(92)	(76)
Net earnings									$ 1,908	$ 344	$ 3,161
Denominator:
Weighted-average shares used to compute basic net EPS (in shares)									1,529	1,646	1,715
Dilutive effect of employee stock plans (in shares)									24	28	24
Weighted-average shares used to compute diluted net EPS (in shares)	1,459	1,531	1,582	1,619	1,647	1,667	1,658	1,700	1,553	1,674	1,739
Basic net earnings (loss) per share:
Continuing operations (in dollars per share)	$ (0.53)	$ 0.30	$ 0.55	$ 0.93	$ 0.23	$ 0.17	$ (0.29)	$ 0.15	$ 1.32	$ 0.26	$ 1.89
Discontinued operations (in dollars per share)	0.01	0.00	(0.05)	(0.03)	0.09	(0.07)	(0.08)	0.01	(0.07)	(0.05)	(0.05)
Total basic net earnings (loss) per share (in dollars per share)	(0.52)	0.30	0.50	0.90	0.32	0.10	(0.37)	0.16	1.25	0.21	1.84
Diluted net earnings (loss) per share:
Continuing operations (in dollars per share)	(0.53)	0.29	0.54	0.92	0.23	0.17	(0.29)	0.15	1.30	0.26	1.86
Discontinued operations (in dollars per share)	0.01	0.00	(0.05)	(0.03)	0.09	(0.07)	(0.08)	0.01	(0.07)	(0.05)	(0.04)
Total diluted net earnings (loss) per share (in dollars per share)	$ (0.52)	$ 0.29	$ 0.49	$ 0.89	$ 0.32	$ 0.10	$ (0.37)	$ 0.16	$ 1.23	$ 0.21	$ 1.82
Anti-dilutive weighted average stock awards (in shares)									2	8	32