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Stockholders' Equity - Summary of Activities Related to Stock Repurchase Program (Detail) - Jul. 31, 2015 - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Total	Total
Equity [Abstract]
Number of shares repurchased	13	227
Average price per share	$ 32.35	$ 33.42
Aggregate purchase price	$ 430
Remaining authorization at end of period	$ 2,030	$ 2,030

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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-Number 210



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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef



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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



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-Section 45



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