Revenue Recognition - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2022 USD ($)	Jul. 31, 2021 USD ($)	Jul. 31, 2022 USD ($) category	Jul. 31, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Number of revenue categories | category			3
Contract with customer, liability, revenue recognized	$ 828	$ 726	$ 1,820	$ 1,560
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-08-01 | Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 4,690		$ 4,690
Performance obligation, expected timing of satisfaction	3 years		3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-08-01 | Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 3,140		$ 3,140
Performance obligation, expected timing of satisfaction	12 months		12 months
Remaining performance obligation percentage	67.00%		67.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-08-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,550		$ 1,550
Performance obligation, expected timing of satisfaction
Remaining performance obligation percentage	33.00%		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