v2.4.0.6
Investments (Available-For-Sale And Held-To-Maturity Investments) (Details) (USD $)
In Millions, unless otherwise specified
Nov. 20, 2011
Aug. 28, 2011
Available-For-Sale and Held-To-Maturity [Line Items]    
Available-for-sale debt maturities, Cost Basis $ 1,361  
Held-to-maturity, Cost Basis 227  
Total investments, Cost Basis 1,588 1,594
Unrealized Gains 8 10
Unrealized Losses 0 0
Total available-for-sale, Recorded Basis 1,369  
Held-to-maturity, Recorded Basis 227  
Total investments, Recorded Basis 1,596 1,604
U.S. Government And Agency Securities [Member]
    
Available-For-Sale and Held-To-Maturity [Line Items]    
Total investments, Recorded Basis 1,103 1,104
Corporate Notes And Bonds [Member]
    
Available-For-Sale and Held-To-Maturity [Line Items]    
Total investments, Recorded Basis 47  
Available-For-Sale Securities [Member]
    
Available-For-Sale and Held-To-Maturity [Line Items]    
Available-for-sale debt maturities, Cost Basis 1,361 1,322
Unrealized Gains 8 10
Unrealized Losses 0 0
Total available-for-sale, Recorded Basis 1,369 1,332
Available-For-Sale Securities [Member] | U.S. Government And Agency Securities [Member]
    
Available-For-Sale and Held-To-Maturity [Line Items]    
Available-for-sale debt maturities, Cost Basis 1,096 1,096
Unrealized Gains 7 8
Unrealized Losses 0 0
Total available-for-sale, Recorded Basis 1,103 1,104
Available-For-Sale Securities [Member] | Corporate Notes And Bonds [Member]
    
Available-For-Sale and Held-To-Maturity [Line Items]    
Available-for-sale debt maturities, Cost Basis 47 6
Unrealized Gains 0 1
Unrealized Losses 0 0
Total available-for-sale, Recorded Basis 47 7
Available-For-Sale Securities [Member] | FDIC-Insured Corporate Bonds [Member]
    
Available-For-Sale and Held-To-Maturity [Line Items]    
Available-for-sale debt maturities, Cost Basis 207 208
Unrealized Gains 1 1
Unrealized Losses 0 0
Total available-for-sale, Recorded Basis 208 209
Available-For-Sale Securities [Member] | Asset And Mortgage-Backed Securities [Member]
    
Available-For-Sale and Held-To-Maturity [Line Items]    
Available-for-sale debt maturities, Cost Basis 11 12
Unrealized Gains 0 0
Unrealized Losses 0 0
Total available-for-sale, Recorded Basis 11 12
Held-To-Maturity Securities [Member] | Certificates Of Deposit [Member]
    
Available-For-Sale and Held-To-Maturity [Line Items]    
Held-to-maturity, Cost Basis 227 272
Held-to-maturity, Recorded Basis $ 227 $ 272