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Leases - Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2022
Apr. 30, 2021
Leases [Abstract]        
Operating lease cost $ 25 $ 21 $ 71 $ 54
Variable lease cost 4 2 11 8
Sublease income (4) (4) (14) (12)
Total net lease cost $ 25 $ 19 $ 68 $ 50