Net Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Numerator:
Net earnings (loss)	$ 5,013	$ 5,113	$ (12,650)
Denominator:
Weighted-average shares used to compute basic net EPS	1,882	1,934	1,974
Dilutive effect of employee stock plans (in shares)	30	16
Weighted-average shares used to compute diluted net EPS	1,912	1,950	1,974
Net earnings (loss) per share:
Basic (in dollars per share)	$ 2.66us-gaap_EarningsPerShareBasic	$ 2.64us-gaap_EarningsPerShareBasic	$ (6.41)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 2.62us-gaap_EarningsPerShareDiluted	$ 2.62us-gaap_EarningsPerShareDiluted	$ (6.41)us-gaap_EarningsPerShareDiluted
Other information related to EPS computation
Antidilutive securities excluded from the calculation of EPS (in shares)	26	52	57
Stock Options
Other information related to EPS computation
Antidilutive securities excluded from the calculation of EPS (in shares)			10

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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