v2.4.1.9

Investments (Gross Realized Gains And Gross Realized Losses Related To Available-For-Sale Investment) (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
Investments [Abstract]
Gross realized gains	$ 55us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 75us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 168us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 267us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses	(11)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(6)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(48)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(33)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Total	$ 44us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	$ 69us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	$ 120us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	$ 234us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet

X

- 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

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

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

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

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

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_InvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration