Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 426	$ 219	$ 1,378	$ 961
Income before provision for income taxes	$ 2,512	$ 1,746	$ 6,892	$ 5,450
Effective tax rate			20.00%	18.00%