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Investments (Proceeds And Gross Realized Gains (Losses) From The Sales Of Available-For-Sale Securities) (Details) (USD $)
In Millions
12 Months Ended
Aug. 28, 2011
Aug. 29, 2010
Aug. 30, 2009
Investments   
Proceeds$ 602$ 309$ 183
Realized gains155
Realized losses$ 0$ 1$ 2