Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 6,340	$ 5,151	$ 12,303	$ 10,016
Americas
Disaggregation of Revenue [Line Items]
Total revenues	4,312	3,596	8,406	6,966
Europe
Disaggregation of Revenue [Line Items]
Total revenues	1,416	1,070	2,718	2,104
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenues	$ 612	$ 485	$ 1,179	$ 946
Untied States | Geographic concentration risk | Revenue
Disaggregation of Revenue [Line Items]
Concentration risk percentage	94.00%	96.00%	94.00%	96.00%
Subscription and support
Disaggregation of Revenue [Line Items]
Total revenues	$ 5,914	$ 4,840	$ 11,450	$ 9,415
Sales
Disaggregation of Revenue [Line Items]
Total revenues	1,477	1,279	2,865	2,524
Service
Disaggregation of Revenue [Line Items]
Total revenues	1,600	1,303	3,106	2,555
Platform and Other
Disaggregation of Revenue [Line Items]
Total revenues	1,882	1,512	3,629	2,876
Marketing and Commerce
Disaggregation of Revenue [Line Items]
Total revenues	$ 955	$ 746	$ 1,850	$ 1,460