Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Maximum percent of salary and bonus eligible for executive deferred compensation plan	75.00%
Executive deferred compensation plan liabilities	$ 153	$ 123
Maximum percent of pre tax salary eligible for contribution to employee plan	50.00%
Additional employer contribution for next six percent of salary (in percent)	125.00%
Additional salary contributed by the employee (in percent)	6.00%
Matching contributions	$ 80	$ 69	$ 59
Credit Karma
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent	90.00%
Defined contribution plan, employer matching contribution, percent of match	100.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay	6.00%