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Fair Value Measurements (Details 1) - USD ($)
$ in Millions
Jan. 31, 2016
Jul. 31, 2015
Cash and cash equivalents    
Cash equivalents:    
Total cash equivalents $ 334 $ 808
Fair value, measurements, recurring | Estimate of fair value measurement    
Cash equivalents:    
Total cash equivalents 280 695
Available-for-sale securities:    
Total available-for-sale securities 190 1,079
Fair value, measurements, recurring | Estimate of fair value measurement | Cash and cash equivalents    
Cash equivalents:    
Total cash equivalents 82 533
Fair value, measurements, recurring | Estimate of fair value measurement | Cash equivalents in funds held for customers    
Cash equivalents:    
Total cash equivalents 198 162
Fair value, measurements, recurring | Estimate of fair value measurement | Available for sale debt securities in investments    
Available-for-sale securities:    
Total available-for-sale securities 0 889
Fair value, measurements, recurring | Estimate of fair value measurement | Available for sale debt securities in funds held for customers    
Available-for-sale securities:    
Total available-for-sale securities 175 175
Fair value, measurements, recurring | Estimate of fair value measurement | Available for sale debt securities in long term investments    
Available-for-sale securities:    
Total available-for-sale securities 15 15
Fair value, measurements, recurring | Level 1    
Cash equivalents:    
Total cash equivalents 280 695
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair value, measurements, recurring | Level 1 | Cash and cash equivalents    
Cash equivalents:    
Total cash equivalents 82 533
Fair value, measurements, recurring | Level 1 | Cash equivalents in funds held for customers    
Cash equivalents:    
Total cash equivalents 198 162
Fair value, measurements, recurring | Level 1 | Available for sale debt securities in investments    
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair value, measurements, recurring | Level 1 | Available for sale debt securities in funds held for customers    
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair value, measurements, recurring | Level 1 | Available for sale debt securities in long term investments    
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair value, measurements, recurring | Level 2    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Total available-for-sale securities 175 1,064
Fair value, measurements, recurring | Level 2 | Cash and cash equivalents    
Cash equivalents:    
Total cash equivalents 0 0
Fair value, measurements, recurring | Level 2 | Cash equivalents in funds held for customers    
Cash equivalents:    
Total cash equivalents 0 0
Fair value, measurements, recurring | Level 2 | Available for sale debt securities in investments    
Available-for-sale securities:    
Total available-for-sale securities 0 889
Fair value, measurements, recurring | Level 2 | Available for sale debt securities in funds held for customers    
Available-for-sale securities:    
Total available-for-sale securities 175 175
Fair value, measurements, recurring | Level 2 | Available for sale debt securities in long term investments    
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair value, measurements, recurring | Level 3    
Cash equivalents:    
Total cash equivalents 0 0
Available-for-sale securities:    
Total available-for-sale securities 15 15
Fair value, measurements, recurring | Level 3 | Cash and cash equivalents    
Cash equivalents:    
Total cash equivalents 0 0
Fair value, measurements, recurring | Level 3 | Cash equivalents in funds held for customers    
Cash equivalents:    
Total cash equivalents 0 0
Fair value, measurements, recurring | Level 3 | Available for sale debt securities in investments    
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair value, measurements, recurring | Level 3 | Available for sale debt securities in funds held for customers    
Available-for-sale securities:    
Total available-for-sale securities 0 0
Fair value, measurements, recurring | Level 3 | Available for sale debt securities in long term investments    
Available-for-sale securities:    
Total available-for-sale securities $ 15 $ 15