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
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Apr. 25, 2015 | Apr. 26, 2014 | Apr. 25, 2015 | Apr. 26, 2014
Investments [Abstract] |  |  |  |
Gross realized gains | $ 55 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 75 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 168 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 267 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses | (11)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (6)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (48)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (33)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Total | $ 44 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 69 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 120 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 234 us-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

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