v2.4.1.9
Investments - Proceeds from Sales of Available for Sale Securities (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 15, 2015
Feb. 16, 2014
Feb. 15, 2015
Feb. 16, 2014
Investments, Debt and Equity Securities [Abstract]        
Proceeds $ 50us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 22us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 67us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 32us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities