Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt Instruments) (Details) $ in Millions	9 Months Ended
	Oct. 31, 2020 USD ($)
Long-term debt due within one year
Balances as of February 1, 2020	$ 5,362
Repayments of long-term debt	(4,132)
Reclassifications of long-term debt	3,126
Other	2
Balances as of October 31, 2020	4,358
Long-term debt
Balances as of February 1, 2020	43,714
Repayments of long-term debt	0
Reclassifications of long-term debt	(3,126)
Other	261
Balances as of October 31, 2020	40,849
Total
Balances as of February 1, 2020	49,076
Repayments of long-term debt	4,132
Reclassifications of long-term debt	0
Other	263
Balances as of October 31, 2020	$ 45,207