Investments (Available-For-Sale And Held-To-Maturity Investments) (Details) (USD $) In Millions	Aug. 28, 2011	Aug. 29, 2010
Available-for-sale debt maturities, Cost Basis	$ 1,322
Held-to-maturity, Cost Basis	272
Total investments, Cost Basis	1,594	1,527
Unrealized Gains	10	8
Unrealized Losses	0	0
Total available-for-sale, Recorded Basis	1,332
Held-to-maturity, Recorded Basis	272
Total investments, Recorded Basis	1,604	1,535
Available-for-Sale Securities [Member]
Available-for-sale debt maturities, Cost Basis	1,322	1,394
Unrealized Gains	10	8
Unrealized Losses	0	0
Total available-for-sale, Recorded Basis	1,332	1,402
Available-for-Sale Securities [Member] | U.S. Government and Agency Securities [Member]
Available-for-sale debt maturities, Cost Basis	1,096	1,222
Unrealized Gains	8	7
Unrealized Losses	0	0
Total available-for-sale, Recorded Basis	1,104	1,229
Available-for-Sale Securities [Member] | Corporate Notes and Bonds [Member]
Available-for-sale debt maturities, Cost Basis	6	10
Unrealized Gains	1	1
Unrealized Losses	0	0
Total available-for-sale, Recorded Basis	7	11
Available-for-Sale Securities [Member] | FDIC Insured Corporate Bonds [Member]
Available-for-sale debt maturities, Cost Basis	208	139
Unrealized Gains	1	0
Unrealized Losses	0	0
Total available-for-sale, Recorded Basis	209	139
Available-for-Sale Securities [Member] | Asset and Mortgage-Backed Securities [Member]
Available-for-sale debt maturities, Cost Basis	12	23
Unrealized Gains	0	0
Unrealized Losses	0	0
Total available-for-sale, Recorded Basis	12	23
Held-to-Maturity Securities [Member] | Certificates of Deposit [Member]
Held-to-maturity, Cost Basis	272	133
Held-to-maturity, Recorded Basis	$ 272	$ 133