Income Taxes - Domestic and Foreign Components of Income Before Provision For (Benefit From) Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Domestic	$ 1,338	$ 2,683	$ 686
Foreign	194	(122)	20
Income before benefit from (provision for) income taxes	$ 1,532	$ 2,561	$ 706