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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Available-for-sale securities:    
Total available-for-sale securities $ 1,979 $ 1,109
Liabilities:    
Senior notes, noncurrent 499 499
Senior Notes   499
Municipal bonds [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 489 260
Municipal auction rate securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 33 41
Corporate notes [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 269 142
U.S. agency securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 69 124
Equity Securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 33 33
Fair Value, Measurements, Recurring [Member]
   
Assets:    
Cash equivalents, primarily money market funds 917 333
Available-for-sale securities:    
Total available-for-sale securities 893 600
Total assets measured at fair value on a recurring basis 1,810 933
Liabilities:    
Senior notes 560 [1] 582 [1]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 489 260
Fair Value, Measurements, Recurring [Member] | Municipal auction rate securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 33 41
Fair Value, Measurements, Recurring [Member] | Corporate notes [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 269 142
Fair Value, Measurements, Recurring [Member] | U.S. agency securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 69 124
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 33 33
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Assets:    
Cash equivalents, primarily money market funds 917 333
Available-for-sale securities:    
Total available-for-sale securities 33 33
Total assets measured at fair value on a recurring basis 950 366
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 33
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 827 526
Total assets measured at fair value on a recurring basis 827 526
Liabilities:    
Senior notes 560 [1] 582 [1]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal bonds [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 489 260
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 269 142
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. agency securities [Member]
   
Available-for-sale securities:    
Total available-for-sale securities 69 124
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 33 41
Total assets measured at fair value on a recurring basis 33 41
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 33 41
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, 2013 was $499 million and at July 31, 2012 was $499 million. See Note 10.