Investments Investments (Gross Realized Gains And Gross Realized Losses Related To Available-For-Sale Investments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014	Jan. 26, 2013
Investments (Gains and Losses on Available-for-Sale Investments) [Abstract]
Available-for-sale Securities, Gross Realized Gains	$ 97	$ 57	$ 192	$ 120
Available-for-sale Securities, Gross Realized Losses	(15)	(44)	(27)	(80)
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 82	$ 13	$ 165	$ 40

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

+ Details

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

+ Details

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

+ Details

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