Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items]
Provision for income taxes	$ 7	$ 9	$ 13	$ 10
Pretax income (loss)	$ 50	$ 25	$ 185	$ 15
Effective income tax rate	14.00%		7.10%
Netting
Effective Income Tax Rate Reconciliation [Line Items]
Effective income tax rate		40.40%		69.60%