Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2026	Apr. 30, 2025
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 7,810
Performance obligation, timing	3 years
Contract with customer, liability, revenue recognized	$ 1,610	$ 1,350
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-05-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 5,380
Remaining performance obligation percentage	69.00%
Performance obligation, expected timing of satisfaction	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-05-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 2,420
Remaining performance obligation percentage	31.00%
Performance obligation, expected timing of satisfaction