Segments - Schedule of Other Segments (Details) - Reportable Segment - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Segment Reporting [Line Items]
Interest income	$ 28	$ 21	$ 52	$ 40
Interest expense	$ 23	$ 19	$ 44	$ 37