Business and Summary of Significant Accounting Policies - Schedule Of Changes in Partner Incentive Program Reserves (Details) - Partner Program reserves - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 74	$ 103	$ 90
Additions charged to costs and expenses or revenues	91	91	91
Additions charged to deferred revenue	696	908	980
Deductions	770	1,028	1,058
Balance at end of year	$ 91	$ 74	$ 103