Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Long-term debt due within one year
Balances as of February 1, 2023	$ 4,191
Proceeds from issuance of long-term debt	0
Repayments of long-term debt	(1,784)
Reclassifications of long-term debt	1,572
Other	(4)
Balances as of April 30, 2023	3,975	$ 3,580
Long-term debt
Balances as of February 1, 2023	34,649
Proceeds from issuance of long-term debt	4,967	0
Repayments of long-term debt	0
Reclassifications of long-term debt	(1,572)
Other	76
Balances as of April 30, 2023	38,120	32,174
Total
Balances as of February 1, 2023	38,840
Proceeds from issuance of long-term debt	4,967	0
Repayments of long-term debt	(1,784)	$ (926)
Reclassifications of long-term debt	0
Other	72
Balances as of April 30, 2023	$ 42,095