Description of Business and Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Accounting Policies [Abstract]
Net income	$ 100	$ 20	$ 328	$ 218
Shares used in basic per share amounts:
Weighted average common shares outstanding (in shares)	283	270	278	266
Shares used in diluted per share amounts:
Weighted average common shares outstanding (in shares)	283	270	278	266
Dilutive common equivalent shares from stock options and restricted stock awards (in shares)	4	3	4	3
Dilutive weighted average common shares outstanding (in shares)	287	273	282	269
Basic and diluted net income per share:
Basic net income per share (in dollars per share)	$ 0.35	$ 0.07	$ 1.18	$ 0.82
Diluted net income per share (in dollars per share)	$ 0.35	$ 0.07	$ 1.16	$ 0.81
Shares excluded from diluted net income per share:
Weighted average stock options and restricted stock units that have been excluded from dilutive common equivalent shares outstanding due to their anti-dilutive effect (in shares)	0	1	0	1