Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 519	$ 408	$ 952	$ 742
Income before provision for income taxes	$ 2,406	$ 1,837	$ 4,380	$ 3,704
Effective tax rate			22.00%	20.00%