Property and Equipment and Other Balance Sheet Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,216	$ 4,414
Less accumulated depreciation and amortization	(2,401)	(1,955)
Property and equipment, net	2,815	2,459
Depreciation amortization expense	678	579	$ 455
Accrued compensation	2,400	1,700
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	293	293
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	487	485
Computers, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,543	1,901
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	237	228
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,656	$ 1,507