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GOODWILL AND INTANGIBLE ASSETS, NET - Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
Apr. 30, 2022
Jul. 31, 2021
Schedule of Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 1,130 $ 1,131
Intangible assets, accumulated amortization 349 296
Finite-lived intangible assets, net 781 835
Indefinite-lived intangible assets, gross carrying amount 1,186 1,187
Indefinite-lived intangible assets, accumulated amortization 349 296
Indefinite-lived intangible assets, net carrying value 837 891
Trademarks and tradenames    
Schedule of Intangible Assets [Line Items]    
Indefinite-lived intangible assets, gross 56 56
Indefinite-lived intangible assets, accumulated amortization 0 0
Indefinite-lived intangible assets, net 56 56
Customer relationships    
Schedule of Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 1,007 1,007
Intangible assets, accumulated amortization 279 234
Finite-lived intangible assets, net 728 773
Pharmacy prescription files    
Schedule of Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 33 33
Intangible assets, accumulated amortization 17 13
Finite-lived intangible assets, net 16 20
Operating lease intangibles    
Schedule of Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 6 7
Intangible assets, accumulated amortization 4 4
Finite-lived intangible assets, net 2 3
Trademarks and tradenames    
Schedule of Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 84 84
Intangible assets, accumulated amortization 49 45
Finite-lived intangible assets, net $ 35 $ 39