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Fair Value Measurements - Fair and Carrying Value (Details) (Level 2 [Member], USD $)
In Millions, unless otherwise specified
May 31, 2012
Sep. 01, 2011
Fair Value [Member]
   
Fair value disclosure [Line Items]    
Fair value of convertible debt instruments $ 2,715 $ 1,845
Other debt instruments 795 436
Carrying Value [Member]
   
Fair value disclosure [Line Items]    
Fair value of convertible debt instruments 2,414 1,578
Other debt instruments $ 784 $ 423