Revenue Recognition - Narrative (Details) $ in Millions	3 Months Ended
	Apr. 30, 2022 USD ($) category	Apr. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Number of revenue categories | category	3
Contract with customer, liability, revenue recognized	$ 987	$ 838
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-05-01 | Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 4,680
Performance obligation, expected timing of satisfaction	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-05-01 | Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 3,140
Performance obligation, expected timing of satisfaction	12 months
Remaining performance obligation percentage	67.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-05-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,540
Performance obligation, expected timing of satisfaction
Remaining performance obligation percentage	33.00%
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Subscription payment terms	30 days
EBA payment terms	30 days
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Subscription payment terms	45 days
EBA payment terms	60 days