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Restructuring, other exit costs, and facility reductions - Narrative (Details) numberOfEmployees in Thousands, $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2026 USD ($) numberOfEmployees	Jan. 31, 2026 USD ($)	Jan. 31, 2025 USD ($)	Jan. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Lease-related asset impairments		$ 12	$ 0	$ 9
Impairment charges		7
January 2026 Plan
Restructuring Cost and Reserve [Line Items]
Percentage of workforce eliminated	7.00%
Number of positions eliminated \| numberOfEmployees	1
Cost incurred	$ 100	100
January 2026 Plan \| Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring cost	135	135
January 2026 Plan \| Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring cost	$ 160	$ 160