Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning of period	$ 1,479	$ 1,433	$ 852
Tax positions taken in prior period, gross increases	25	77	12
Tax positions taken in prior period, gross decreases	(27)	(40)	(37)
Tax positions taken in current period, gross increases	358	107	640
Settlements	0	(87)	(27)
Lapse of statute of limitations	(7)	(19)	(4)
Currency translation effect	(6)		(3)
Currency translation effect		8
End of period	$ 1,822	$ 1,479	$ 1,433