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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jul. 31, 2012
Jul. 31, 2011
Available-for-sale securities:    
Total available-for-sale securities $ 1,109 $ 1,898
Liabilities:    
Senior notes, noncurrent 499 499
Senior Notes 499 999
Municipal bonds [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 260 434
Municipal auction rate securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 41 59
Corporate notes [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 142 288
U.S. agency securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 124 152
Equity Securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 33 0
Fair Value, Measurements, Recurring [Member]
   
Assets:    
Cash equivalents, primarily money market funds 333 854
Available-for-sale securities:    
Total available-for-sale securities 600 933
Total assets measured at fair value on a recurring basis 933 1,787
Liabilities:    
Senior notes 582 [1] 1,084 [1]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 260 434
Fair Value, Measurements, Recurring [Member] | Municipal auction rate securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 41 59
Fair Value, Measurements, Recurring [Member] | Corporate notes [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 142 288
Fair Value, Measurements, Recurring [Member] | U.S. agency securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 124 152
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 33 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Assets:    
Cash equivalents, primarily money market funds 333 854
Available-for-sale securities:    
Total available-for-sale securities 33 0
Total assets measured at fair value on a recurring basis 366 854
Liabilities:    
Senior notes 0 [1] 0 [1]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal bonds [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal auction rate securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate notes [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. agency securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 33 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
   
Assets:    
Cash equivalents, primarily money market funds 0 0
Available-for-sale securities:    
Total available-for-sale securities 526 874
Total assets measured at fair value on a recurring basis 526 874
Liabilities:    
Senior notes 582 [1] 1,084 [1]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal bonds [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 260 434
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal auction rate securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate notes [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 142 288
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. agency securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 124 152
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Assets:    
Cash equivalents, primarily money market funds 0 0
Available-for-sale securities:    
Total available-for-sale securities 41 59
Total assets measured at fair value on a recurring basis 41 59
Liabilities:    
Senior notes 0 [1] 0 [1]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal bonds [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal auction rate securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 41 59
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate notes [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. agency securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities $ 0 $ 0
[1] Carrying value on our balance sheets at July 31, 2012 was $499 million and at July 31, 2011 was $999 million. See Note 10.