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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jan. 31, 2026
Jul. 31, 2025
Assets:    
Cash equivalents, primarily money market funds $ 2,942 $ 2,884
Available-for-sale debt securities, fair value 183 1,818
Fair value, measurements, recurring    
Assets:    
Cash equivalents, primarily money market funds 318 1,790
Available-for-sale debt securities, fair value 183 1,818
Total assets measured at fair value on a recurring basis 501 3,608
Fair value, measurements, recurring | Level 1    
Assets:    
Cash equivalents, primarily money market funds 318 1,790
Available-for-sale debt securities, fair value 0 0
Total assets measured at fair value on a recurring basis 318 1,790
Fair value, measurements, recurring | Level 2    
Assets:    
Cash equivalents, primarily money market funds 0 0
Available-for-sale debt securities, fair value 183 1,818
Total assets measured at fair value on a recurring basis 183 1,818
Fair value, measurements, recurring | Corporate notes    
Assets:    
Available-for-sale debt securities, fair value 178 502
Fair value, measurements, recurring | Corporate notes | Level 1    
Assets:    
Available-for-sale debt securities, fair value 0 0
Fair value, measurements, recurring | Corporate notes | Level 2    
Assets:    
Available-for-sale debt securities, fair value 178 502
Fair value, measurements, recurring | U.S. agency securities    
Assets:    
Available-for-sale debt securities, fair value 5 1,316
Fair value, measurements, recurring | U.S. agency securities | Level 1    
Assets:    
Available-for-sale debt securities, fair value 0 0
Fair value, measurements, recurring | U.S. agency securities | Level 2    
Assets:    
Available-for-sale debt securities, fair value $ 5 $ 1,316