Income Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 101	$ 143	$ 209	$ 225
Pre-tax income	$ 593	$ 456	$ 1,192	$ 690