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Fair Value Measurements (Details) (USD $)
In Millions
Jul. 31, 2011
Jul. 31, 2010
Jun. 30, 2010
Available-for-sale debt securities:      
Total available-for-sale debt securities $ 1,898 $ 2,050  
Liabilities:      
Senior notes 999 998  
Senior notes, noncurrent 499 998  
Fair Value, Measurements, Recurring [Member]
     
Assets:      
Cash equivalents, primarily money market funds 854 330  
Available-for-sale debt securities:      
Total available-for-sale debt securities 933 1,645  
Total assets measured at fair value on a recurring basis 1,787 1,975  
Liabilities:      
Senior notes 1,084 [1] 1,086 [1]  
Remaining balance of municipal auction rate securities settled     110
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
     
Assets:      
Cash equivalents, primarily money market funds 854 330  
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Total assets measured at fair value on a recurring basis 854 330  
Liabilities:      
Senior notes 0 [1] 0 [1]  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal bonds [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal auction rate securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate notes [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. agency securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
     
Assets:      
Cash equivalents, primarily money market funds 0 0  
Available-for-sale debt securities:      
Total available-for-sale debt securities 874 1,558  
Total assets measured at fair value on a recurring basis 874 1,558  
Liabilities:      
Senior notes 1,084 [1] 1,086 [1]  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal bonds [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 434 1,050  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal auction rate securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate notes [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 288 334  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. agency securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 152 174  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
     
Assets:      
Cash equivalents, primarily money market funds 0 0  
Available-for-sale debt securities:      
Total available-for-sale debt securities 59 87  
Total assets measured at fair value on a recurring basis 59 87  
Liabilities:      
Senior notes 0 [1] 0 [1]  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal bonds [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal auction rate securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 59 87  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate notes [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. agency securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 0 0  
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 434 1,050  
Fair Value, Measurements, Recurring [Member] | Municipal auction rate securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 59 87  
Fair Value, Measurements, Recurring [Member] | Corporate notes [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 288 334  
Fair Value, Measurements, Recurring [Member] | U.S. agency securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 152 174  
Municipal bonds [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 434 1,050  
Municipal auction rate securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 59 87  
Corporate notes [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities 288 334  
U.S. agency securities [Member]
     
Available-for-sale debt securities:      
Total available-for-sale debt securities $ 152 $ 174  
[1] Carrying value on our balance sheets at July 31, 2011 was $999 million and at July 31, 2010 was $998 million. See Note 10.