Income Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Tax Credit Carryforward [Line Items]
Provision for income taxes	$ 49	$ (25)
(Loss) income before income taxes	195	$ 131
Unrecognized tax benefits	212
Unrecognized tax benefits that would reduce the valuation allowance if recognized	34
Effect of change in unrecognized tax benefits	7
SEC Schedule, 12-09, Valuation Allowance, Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Amount of gross unrecognized tax benefits that would impact the effective tax rate, if recognized	$ 178