Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,444	$ 4,072	$ 126
Other comprehensive income (loss), net of reclassification adjustments:
Foreign currency translation and other gains (losses)	(55)	40	(59)
Unrealized gains (losses) on marketable securities and privately held debt securities	(83)	15	26
Other comprehensive income (loss), before tax	(138)	55	(33)
Tax effect	14	(4)	(2)
Other comprehensive income (loss), net	(124)	51	(35)
Comprehensive income	$ 1,320	$ 4,123	$ 91