Income Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Income Tax Disclosure [Abstract]
Provision for income tax expense (benefit)	$ 79	$ 44	$ 175	$ 139
Pre-tax income	320	$ 242	799	$ 669
Unrecognized tax benefits	234		234
Amount of gross unrecognized tax benefits that would impact the effective tax rate, if recognized	195		195
Unrecognized tax benefits that would reduce valuation allowance if recognized	39		39
Decrease in unrecognized tax benefits in the next twelve months for statute lapse	$ 2		$ 2