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Investments - Proceeds from Sales of Available-for-sale Securities (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Feb. 14, 2016 | Feb. 15, 2015 | Feb. 14, 2016 | Feb. 15, 2015
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Proceeds | $ 139 | $ 50 | $ 189 | $ 67

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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