Goodwill and Acquired Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
	Jan. 31, 2022	Jul. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 5,613
Goodwill Acquired	8,120
Foreign Currency Translation	(1)
Ending balance	13,732
Small Business & Self-Employed
Goodwill [Roll Forward]
Beginning balance	1,578
Goodwill Acquired	8,103
Foreign Currency Translation	(1)
Ending balance	9,680
Consumer
Goodwill [Roll Forward]
Beginning balance	42
Goodwill Acquired	10
Foreign Currency Translation	0
Ending balance	52
Accumulated impairment loss		$ 114
ProConnect
Goodwill [Roll Forward]
Beginning balance	95
Goodwill Acquired	2
Foreign Currency Translation	0
Ending balance	97
Credit Karma
Goodwill [Roll Forward]
Beginning balance	3,898
Goodwill Acquired	5
Foreign Currency Translation	0
Ending balance	$ 3,903