Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Long-term debt due within one year
Balances as of February 1, 2024	$ 3,447
Repayments of long-term debt	(1,574)
Other	(8)
Balances as of April 30, 2024	1,865	$ 3,975
Long-term debt
Balances as of February 1, 2024	36,132
Repayments of long-term debt	0
Other	(204)
Balances as of April 30, 2024	35,928	38,120
Total
Balances as of February 1, 2024	39,579
Repayments of long-term debt	(1,574)	$ (1,784)
Other	(212)
Balances as of April 30, 2024	$ 37,793