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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 2,062	$ 1,826	$ 1,557
Other comprehensive income (loss), net of income taxes:
Unrealized gain (loss) on available-for-sale debt securities	(3)	5	3
Foreign currency translation gain (loss)	11	(1)	(3)
Total other comprehensive income, net	8	4	0
Comprehensive income	$ 2,070	$ 1,830	$ 1,557

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