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Fair Value Measurements - Schedule of financial assets and liabilities measured at fair value (Details) - USD ($)
$ in Millions
Jul. 31, 2017
Jul. 31, 2016
Liabilities:    
Senior Notes, Carrying Value   $ 500
Municipal bonds    
Available-for-sale debt securities:    
Total available-for-sale securities $ 63 186
Municipal auction rate securities    
Available-for-sale debt securities:    
Total available-for-sale securities 15 15
Corporate notes    
Available-for-sale debt securities:    
Total available-for-sale securities 382 420
U.S. agency securities    
Available-for-sale debt securities:    
Total available-for-sale securities 3 36
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents, primarily money market funds and time deposits 181 416
Available-for-sale debt securities:    
Total available-for-sale securities 463 657
Total assets measured at fair value on a recurring basis 644 1,073
Liabilities:    
Senior notes [1] 0 515
Fair Value, Measurements, Recurring | Municipal bonds    
Available-for-sale debt securities:    
Total available-for-sale securities 63 186
Fair Value, Measurements, Recurring | Municipal auction rate securities    
Available-for-sale debt securities:    
Total available-for-sale securities 15 15
Fair Value, Measurements, Recurring | Corporate notes    
Available-for-sale debt securities:    
Total available-for-sale securities 382 420
Fair Value, Measurements, Recurring | U.S. agency securities    
Available-for-sale debt securities:    
Total available-for-sale securities 3 36
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Cash equivalents, primarily money market funds and time deposits 181 416
Available-for-sale debt securities:    
Total available-for-sale securities 0 0
Total assets measured at fair value on a recurring basis 181 416
Liabilities:    
Senior notes [1] 0 0
Fair Value, Measurements, Recurring | Level 1 | Municipal bonds    
Available-for-sale debt securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Municipal auction rate securities    
Available-for-sale debt securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate notes    
Available-for-sale debt securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. agency securities    
Available-for-sale debt securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Cash equivalents, primarily money market funds and time deposits 0 0
Available-for-sale debt securities:    
Total available-for-sale securities 448 642
Total assets measured at fair value on a recurring basis 448 642
Liabilities:    
Senior notes [1] 0 515
Fair Value, Measurements, Recurring | Level 2 | Municipal bonds    
Available-for-sale debt securities:    
Total available-for-sale securities 63 186
Fair Value, Measurements, Recurring | Level 2 | Municipal auction rate securities    
Available-for-sale debt securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 2 | Corporate notes    
Available-for-sale debt securities:    
Total available-for-sale securities 382 420
Fair Value, Measurements, Recurring | Level 2 | U.S. agency securities    
Available-for-sale debt securities:    
Total available-for-sale securities 3 36
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Cash equivalents, primarily money market funds and time deposits 0 0
Available-for-sale debt securities:    
Total available-for-sale securities 15 15
Total assets measured at fair value on a recurring basis 15 15
Liabilities:    
Senior notes [1] 0 0
Fair Value, Measurements, Recurring | Level 3 | Municipal bonds    
Available-for-sale debt securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | Municipal auction rate securities    
Available-for-sale debt securities:    
Total available-for-sale securities 15 15
Fair Value, Measurements, Recurring | Level 3 | Corporate notes    
Available-for-sale debt securities:    
Total available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. agency securities    
Available-for-sale debt securities:    
Total available-for-sale securities $ 0 $ 0
[1] Carrying value on our balance sheet at July 31, 2016 was $500 million. See Note 7, “Current Liabilities – Short-Term Debt” for more information.