Taxes - Narrative (Details) - USD ($) $ in Millions	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Taxes [Line Items]
Deferred tax liability	$ 1,000
Operating loss and capital loss carryforwards	30,300
Valuation allowances	7,485	$ 7,815
Unrecognized tax benefits	3,540	3,307	$ 3,245	$ 3,135
Unrecognized tax benefits that would impact effective tax rate	1,700	$ 1,500
Operating loss and capital loss carryforward expiring by 2044
Taxes [Line Items]
Operating loss and capital loss carryforwards	$ 16,500