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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,464	$ 1,084	$ 1,682	$ 1,381
Other comprehensive income (loss), net of income taxes:
Unrealized loss on available-for-sale debt securities	(2)	(2)	(3)	0
Foreign currency translation gain (loss)	1	(7)	11	(8)
Total other comprehensive income (loss), net	(1)	(9)	8	(8)
Comprehensive income	$ 1,463	$ 1,075	$ 1,690	$ 1,373

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