Revenues - Remaining Performance Obligation (Details) - USD ($) $ in Billions	Jan. 31, 2022	Jan. 31, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Current	$ 22.0	$ 18.0
Noncurrent	21.7	18.1
Total	43.7	$ 36.1
Slack
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 1.2
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-02-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Noncurrent remaining performance obligation, recognition period	13 months
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-02-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Noncurrent remaining performance obligation, recognition period	36 months