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Investments (Maturities Of Securities Excluding Trading Securities) (Details) (USD $)
In Millions
Aug. 28, 2011
Investments 
Available-for-sale securities, cost basis due in one year or less$ 890
Available-for-sale securities, cost basis due in one year through five years426
Available-for-sale securities, cost basis due after five years6
Available-for-sale securities, cost basis, total1,322
Available-for-sale securities, fair value due in one year or less892
Available-for-sale securities, fair value due in one year through five years433
Available-for-sale securities, fair value after five years7
Available-for-sale securities, fair value, total1,332
Held-to-maturity, cost basis due in one year or less272
Held-to-maturity, cost basis due after one year through five years0
Held-to-maturity, cost basis due after five years0
Held-to-maturity, cost basis, total272
Held-to-maturity, fair value in one year or less272
Held-to-maturity, fair value after one year through five years0
Held-to-maturity, fair value after five years0
Held-to-maturity securities, fair value, total$ 272