Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Stock-based expenses	$ 812	$ 566	$ 2,016	$ 1,648
Cost of revenues
Amortization of intangibles acquired through business combinations	272	169	624	494
Stock-based expenses	103	65	280	180
Research and development
Stock-based expenses	276	181	646	531
Marketing and sales
Amortization of intangibles acquired through business combinations	236	114	491	344
Stock-based expenses	316	242	817	718
General and administrative
Stock-based expenses	$ 117	$ 78	$ 273	$ 219