GOODWILL AND INTANGIBLE ASSETS, NET - Identifiable Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2022	Jan. 30, 2021	Jan. 29, 2022	Jan. 30, 2021	Jul. 31, 2021
Goodwill and Intangible Assets [Abstract]
Amortization expense	$ 18	$ 19	$ 36	$ 42
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	1,131		1,131		$ 1,131
Intangible assets, accumulated amortization	332		332		296
Finite-lived intangible assets, net	799		799		835
Indefinite-lived intangible assets, gross carrying amount	1,187		1,187		1,187
Indefinite-lived intangible assets, accumulated amortization	332		332		296
Indefinite-lived intangible assets, net carrying value	855		855		891
Trademarks and tradenames
Schedule of Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross	56		56		56
Indefinite-lived intangible assets, accumulated amortization	0		0		0
Indefinite-lived intangible assets, net	56		56		56
Customer relationships
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	1,007		1,007		1,007
Intangible assets, accumulated amortization	264		264		234
Finite-lived intangible assets, net	743		743		773
Pharmacy prescription files
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	33		33		33
Intangible assets, accumulated amortization	15		15		13
Finite-lived intangible assets, net	18		18		20
Operating lease intangibles
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	7		7		7
Intangible assets, accumulated amortization	5		5		4
Finite-lived intangible assets, net	2		2		3
Trademarks and tradenames
Schedule of Intangible Assets [Line Items]
Finite-lived intangible assets, gross	84		84		84
Intangible assets, accumulated amortization	48		48		45
Finite-lived intangible assets, net	$ 36		$ 36		$ 39