v2.4.1.9

Investments (Realized Net Gains (Losses) Related To Available-For-Sale Investments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 25, 2015	Apr. 26, 2014	Apr. 25, 2015	Apr. 26, 2014
Schedule of Available-for-sale Securities [Line Items]
Total	$ 44us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	$ 69us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	$ 120us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	$ 234us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Net gains on investments in publicly traded equity securities
Schedule of Available-for-sale Securities [Line Items]
Total	38us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	55us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	94us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	199us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Net gains on investments in fixed income securities
Schedule of Available-for-sale Securities [Line Items]
Total	$ 6us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember	$ 14us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember	$ 26us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember	$ 35us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember

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- Definition

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

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