Taxes (Schedule of Income Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
U.S.	$ 15,536	$ 18,068	$ 15,019
Non-U.S.	3,160	2,496	5,097
Income before income taxes	$ 18,696	$ 20,564	$ 20,116