Transactions with Former Parent - Schedule of Net Transfers from (to) Former Parent (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 31, 2021	Jul. 31, 2021
Transaction With Former Parent [Line Items]
Net Transfers to Former Parent	$ (275)	$ (336)
Former Parent
Transaction With Former Parent [Line Items]
Net Transfers to Former Parent	(275)	(336)
Former Parent | Cash Pooling and General Financing Activities, Net
Transaction With Former Parent [Line Items]
Net Transfers to Former Parent	(322)	(431)
Former Parent | Long-lived Assets
Transaction With Former Parent [Line Items]
Net Transfers to Former Parent	(4)	16
Former Parent | Corporate Expense Allocations
Transaction With Former Parent [Line Items]
Net Transfers to Former Parent	30	49
Former Parent | Share-based Compensation Expense
Transaction With Former Parent [Line Items]
Net Transfers to Former Parent	8	15
Former Parent | Assumed Income Tax Payments
Transaction With Former Parent [Line Items]
Net Transfers to Former Parent	$ 13	$ 15